Contract 0x0895196562c7868c5be92459fae7f877ed450452 8

 

Contract Overview

Autofarm: Vault
Balance:
0 BNB

BNB Value:
$0.00

Token:
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x236eb2e6d79a3ec984b1980a2a2957d434ea44212329f3b6126f39b63884fd9fWithdraw111436232021-09-22 18:39:1844 secs ago0x42532fa38a09b6065d84b100c7790f523de54b38 IN  Autofarm: Vault0 BNB0.001794855
0xe72b0dff327c9fcb81744460f2c5ac48afe8731920ac5bd561dee809d23722b0Deposit111436082021-09-22 18:38:331 min ago0x2a2036fcf77491a980c0197baf33c785937db6f4 IN  Autofarm: Vault0 BNB0.001510605
0x04fea2b6aafc467de9c098dcdc76cdfc6f3557c8cd953b7224534dee4f5d36bcDeposit111435542021-09-22 18:35:514 mins ago0xd798492e3c32c70cf0452a3ecb15a5de805eb861 IN  Autofarm: Vault0 BNB0.00169361
0x17a83839c475b3ed1de1dc8082862134634bc33443cfafc05883b73172f4daefWithdraw111435432021-09-22 18:35:184 mins ago0xb353e651ec842d07cc7787ac4ee07ac4fdab1832 IN  Autofarm: Vault0 BNB0.00173005
0x13628b3d7fad1735e60a855832a4527cd38d24c4a791f478ce9305ad485b11ccWithdraw111435412021-09-22 18:35:124 mins ago0x4209c4029adfaf4c74075b9cc8bf285ec53d9388 IN  Autofarm: Vault0 BNB0.00069158
0xec9c969ee229ad92bcaa2769d67dab24762c6c031980ee2da298c1545bfe76c7Deposit111435152021-09-22 18:33:546 mins ago0x190d9635124178b9dc265e16cfc3177e5d3e40bc IN  Autofarm: Vault0 BNB0.001455515
0x8fa915200120d9da014c02a4d38fb86612e9ae72567d8ee3407ac6222e8b8c0bWithdraw111435022021-09-22 18:33:156 mins ago0x74c1d8016297f48b7a672cfe29bdc806281bd7e3 IN  Autofarm: Vault0 BNB0.000874045
0x84309a85394bfad52aed7441dc99a07ebe7b6c53c4ad36a72174a27f9f93bf24Deposit111434942021-09-22 18:32:517 mins ago0xecf2e7bc1253d74e5ae624b0d6875e499bd1e234 IN  Autofarm: Vault0 BNB0.001649395
0x108b2438ab724a6a90ba5d1f3c7e46a8039dfe6099d5707a082eed987a8a83a0Withdraw111434912021-09-22 18:32:407 mins ago0x74c1d8016297f48b7a672cfe29bdc806281bd7e3 IN  Autofarm: Vault0 BNB0.00069086
0x2d5ae1f7416f28e05ba909759a06f655e97072ae5576121e5b8392adc3d162feDeposit111434832021-09-22 18:32:167 mins ago0xd04177522280f03806130608debad1d35a362c21 IN  Autofarm: Vault0 BNB0.00092892
0x83e79d6fa76f49333bfa93738d00a547fc07fc5eb0579e7cf3100146d458567aWithdraw111434682021-09-22 18:31:318 mins ago0xafb9af9ed31b6b86b9101210db466f832d360fef IN  Autofarm: Vault0 BNB0.00157985
0x5798cec2eb9a3885bc6ba735c17b2d9acf2b0fd4c7f5d77165d9f518c830d6d5Withdraw111434642021-09-22 18:31:198 mins ago0xafb9af9ed31b6b86b9101210db466f832d360fef IN  Autofarm: Vault0 BNB0.00150479
0xbd7517de61382f2b34579dec40f056ec037ae0fe3f4d008a7d9e311ee0992d1fWithdraw111434522021-09-22 18:30:439 mins ago0xafb9af9ed31b6b86b9101210db466f832d360fef IN  Autofarm: Vault0 BNB0.00150485
0xcb4573787ca677be2562358d85f5a3d516ab2e25042c85e54a709a2d6b1e13a9Deposit111434422021-09-22 18:30:139 mins ago0x7dbb20a50c8a51926ba7d479bff4e0be3edf8674 IN  Autofarm: Vault0 BNB0.001769445
0xc505476f73abcbc9888e6f53a872e5fabca7251b921f029a4801d7a27eea54d5Deposit111434252021-09-22 18:29:2210 mins ago0xa6760cb6f724b663b4e83cd1382f3c9eb706735b IN  Autofarm: Vault0 BNB0.00144317
0x9bb63c46e3c1f2f1b4f589ca234e51b1cb0e49378f0903be8924c22020c9e097Withdraw111434192021-09-22 18:29:0410 mins ago0x5f0ff52df8df2c5351c47b6711c33f36c5402909 IN  Autofarm: Vault0 BNB0.00061658
0x779025f075da9bde80efdd2d3f177f818371eb5fc1a5095aceb8abf1ac91a338Withdraw111434182021-09-22 18:29:0111 mins ago0x2a2036fcf77491a980c0197baf33c785937db6f4 IN  Autofarm: Vault0 BNB0.00157979
0xb9667d5dfd091e4e6a2aca63abf27afba5f9760a4bd3bd8e611b223426938746Withdraw111434122021-09-22 18:28:4311 mins ago0x5f0ff52df8df2c5351c47b6711c33f36c5402909 IN  Autofarm: Vault0 BNB0.00061658
0x50c65c3f3061e64fb14ccdec625c2d0dc9a79005c5a5c45ebc14e0dc883a132cDeposit111433972021-09-22 18:27:5812 mins ago0x5f0ff52df8df2c5351c47b6711c33f36c5402909 IN  Autofarm: Vault0 BNB0.001557185
0x2cddb9ec18e546c7e735a1cbed8b98f880dd1d998246287735477bb4e901ffd7Deposit111433842021-09-22 18:27:1912 mins ago0xecf2e7bc1253d74e5ae624b0d6875e499bd1e234 IN  Autofarm: Vault0 BNB0.00136817
0xdd7b9b31b8de65bdb33ee71128db31ceac94c56971f230be103b74ef67028efbDeposit111433712021-09-22 18:26:4013 mins ago0x985727904aecf487f08d81855ec3601b361cd7a3 IN  Autofarm: Vault0 BNB0.00161861
0x5f8476d1a8c235eb625f5dbbd9b6cc4e020b6a4a4221b9196492c58745dd0e67Deposit111433712021-09-22 18:26:4013 mins ago0xa2b40e1cc6ba02c980e39534f5ce43fd20d8a755 IN  Autofarm: Vault0 BNB0.001542505
0x2234274e38889ebe91b14ce51c7dd355ef9d4830fca915fac0e6780cffae009aWithdraw111433592021-09-22 18:26:0413 mins ago0x5713d568cfcde3b1824fa56d1eaa598bb61c3634 IN  Autofarm: Vault0 BNB0.00157985
0xfb6107f2696b2fef9eb2e4b9c4fd44f4d77d277906ecc25f60d0f7f606df2c8cWithdraw111433542021-09-22 18:25:4914 mins ago0xafb9af9ed31b6b86b9101210db466f832d360fef IN  Autofarm: Vault0 BNB0.00061652
0x0dda42873956f4c382329ba5bfde14f779f7d92d5e954838809312c9f77c4cb9Withdraw111433532021-09-22 18:25:4614 mins ago0xafb9af9ed31b6b86b9101210db466f832d360fef IN  Autofarm: Vault0 BNB0.00061652
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OVERVIEW

Main contract for users to deposit and withdraw from Autofarm vaults.

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x5208ffd1251aeeaa9a42c068088a72957e66c65bb0eb179b56c826cffb97243561487812021-03-31 2:54:38175 days 15 hrs ago BSC: Token Hub Autofarm: Vault0.019 BNB
0x83be6ea89cd86839d9255c7fc85efca9280c6931504f0884b7254be46b2f4d0654713352021-03-07 11:59:42199 days 6 hrs ago Autofarm: Vault 0x1004a537a1c39ee9d38110bfe3042627c2cd5bbe0 BNB
0x83be6ea89cd86839d9255c7fc85efca9280c6931504f0884b7254be46b2f4d0654713352021-03-07 11:59:42199 days 6 hrs ago Autofarm: Vault PancakeSwap: CAKE Token0 BNB
0x83be6ea89cd86839d9255c7fc85efca9280c6931504f0884b7254be46b2f4d0654713352021-03-07 11:59:42199 days 6 hrs ago Autofarm: Vault PancakeSwap: CAKE Token0 BNB
0x83be6ea89cd86839d9255c7fc85efca9280c6931504f0884b7254be46b2f4d0654713352021-03-07 11:59:42199 days 6 hrs ago Autofarm: Vault PancakeSwap: CAKE Token0 BNB
0x83be6ea89cd86839d9255c7fc85efca9280c6931504f0884b7254be46b2f4d0654713352021-03-07 11:59:42199 days 6 hrs ago Autofarm: Vault Autofarm: AUTO Token0 BNB
0x83be6ea89cd86839d9255c7fc85efca9280c6931504f0884b7254be46b2f4d0654713352021-03-07 11:59:42199 days 6 hrs ago Autofarm: Vault Autofarm: AUTO Token0 BNB
0x83be6ea89cd86839d9255c7fc85efca9280c6931504f0884b7254be46b2f4d0654713352021-03-07 11:59:42199 days 6 hrs ago Autofarm: Vault Autofarm: AUTO Token0 BNB
0x83be6ea89cd86839d9255c7fc85efca9280c6931504f0884b7254be46b2f4d0654713352021-03-07 11:59:42199 days 6 hrs ago Autofarm: Vault 0x1004a537a1c39ee9d38110bfe3042627c2cd5bbe0 BNB
0x8c83493abdcd3b61edc5caa96a2ce413488877bdf00dc79d74d0a4dc7ea21c2554713322021-03-07 11:59:33199 days 6 hrs ago Autofarm: Vault PancakeSwap: CAKE Token0 BNB
0x8c83493abdcd3b61edc5caa96a2ce413488877bdf00dc79d74d0a4dc7ea21c2554713322021-03-07 11:59:33199 days 6 hrs ago Autofarm: Vault PancakeSwap: CAKE Token0 BNB
0x8c83493abdcd3b61edc5caa96a2ce413488877bdf00dc79d74d0a4dc7ea21c2554713322021-03-07 11:59:33199 days 6 hrs ago Autofarm: Vault 0x1004a537a1c39ee9d38110bfe3042627c2cd5bbe0 BNB
0x8c83493abdcd3b61edc5caa96a2ce413488877bdf00dc79d74d0a4dc7ea21c2554713322021-03-07 11:59:33199 days 6 hrs ago Autofarm: Vault Autofarm: AUTO Token0 BNB
0x8c83493abdcd3b61edc5caa96a2ce413488877bdf00dc79d74d0a4dc7ea21c2554713322021-03-07 11:59:33199 days 6 hrs ago Autofarm: Vault Autofarm: AUTO Token0 BNB
0x8c83493abdcd3b61edc5caa96a2ce413488877bdf00dc79d74d0a4dc7ea21c2554713322021-03-07 11:59:33199 days 6 hrs ago Autofarm: Vault 0x1004a537a1c39ee9d38110bfe3042627c2cd5bbe0 BNB
0x8c83493abdcd3b61edc5caa96a2ce413488877bdf00dc79d74d0a4dc7ea21c2554713322021-03-07 11:59:33199 days 6 hrs ago Autofarm: Vault 0x1004a537a1c39ee9d38110bfe3042627c2cd5bbe0 BNB
0x8c83493abdcd3b61edc5caa96a2ce413488877bdf00dc79d74d0a4dc7ea21c2554713322021-03-07 11:59:33199 days 6 hrs ago Autofarm: Vault Autofarm: AUTO Token0 BNB
0x8c83493abdcd3b61edc5caa96a2ce413488877bdf00dc79d74d0a4dc7ea21c2554713322021-03-07 11:59:33199 days 6 hrs ago Autofarm: Vault Autofarm: AUTO Token0 BNB
0x8c83493abdcd3b61edc5caa96a2ce413488877bdf00dc79d74d0a4dc7ea21c2554713322021-03-07 11:59:33199 days 6 hrs ago Autofarm: Vault Autofarm: AUTO Token0 BNB
0x8c83493abdcd3b61edc5caa96a2ce413488877bdf00dc79d74d0a4dc7ea21c2554713322021-03-07 11:59:33199 days 6 hrs ago Autofarm: Vault 0x1004a537a1c39ee9d38110bfe3042627c2cd5bbe0 BNB
0x02d8192c5b6db6baee6136946510dd2d8e7d2fa63e0e5f4e86cb14fab24912ef54713302021-03-07 11:59:27199 days 6 hrs ago Autofarm: Vault 0xc790845a3b6febf32f600b88371be556b02280010 BNB
0x02d8192c5b6db6baee6136946510dd2d8e7d2fa63e0e5f4e86cb14fab24912ef54713302021-03-07 11:59:27199 days 6 hrs ago Autofarm: Vault PancakeSwap: BUSD-EGG 20 BNB
0x02d8192c5b6db6baee6136946510dd2d8e7d2fa63e0e5f4e86cb14fab24912ef54713302021-03-07 11:59:27199 days 6 hrs ago Autofarm: Vault PancakeSwap: BUSD-EGG 20 BNB
0x02d8192c5b6db6baee6136946510dd2d8e7d2fa63e0e5f4e86cb14fab24912ef54713302021-03-07 11:59:27199 days 6 hrs ago Autofarm: Vault PancakeSwap: BUSD-EGG 20 BNB
0x02d8192c5b6db6baee6136946510dd2d8e7d2fa63e0e5f4e86cb14fab24912ef54713302021-03-07 11:59:27199 days 6 hrs ago Autofarm: Vault Autofarm: AUTO Token0 BNB
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Loading

Contract Source Code Verified (Exact Match)

Contract Name:
AutoFarmV2

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at BscScan.com on 2021-01-21
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

// import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol";
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}

contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender)
        public
        view
        virtual
        override
        returns (uint256)
    {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            _msgSender(),
            _allowances[sender][_msgSender()].sub(
                amount,
                "ERC20: transfer amount exceeds allowance"
            )
        );
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue)
        public
        virtual
        returns (bool)
    {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender].add(addedValue)
        );
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue)
        public
        virtual
        returns (bool)
    {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender].sub(
                subtractedValue,
                "ERC20: decreased allowance below zero"
            )
        );
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(
            amount,
            "ERC20: transfer amount exceeds balance"
        );
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(
            amount,
            "ERC20: burn amount exceeds balance"
        );
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

// import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/SafeERC20.sol";
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(
            address(this).balance >= amount,
            "Address: insufficient balance"
        );

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{value: amount}("");
        require(
            success,
            "Address: unable to send value, recipient may have reverted"
        );
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data)
        internal
        returns (bytes memory)
    {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return
            functionCallWithValue(
                target,
                data,
                value,
                "Address: low-level call with value failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(
            address(this).balance >= value,
            "Address: insufficient balance for call"
        );
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) =
            target.call{value: value}(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data)
        internal
        view
        returns (bytes memory)
    {
        return
            functionStaticCall(
                target,
                data,
                "Address: low-level static call failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.3._
     */
    function functionDelegateCall(address target, bytes memory data)
        internal
        returns (bytes memory)
    {
        return
            functionDelegateCall(
                target,
                data,
                "Address: low-level delegate call failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.3._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) private pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transfer.selector, to, value)
        );
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)
        );
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.approve.selector, spender, value)
        );
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance =
            token.allowance(address(this), spender).add(value);
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(
                token.approve.selector,
                spender,
                newAllowance
            )
        );
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance =
            token.allowance(address(this), spender).sub(
                value,
                "SafeERC20: decreased allowance below zero"
            );
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(
                token.approve.selector,
                spender,
                newAllowance
            )
        );
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata =
            address(token).functionCall(
                data,
                "SafeERC20: low-level call failed"
            );
        if (returndata.length > 0) {
            // Return data is optional
            // solhint-disable-next-line max-line-length
            require(
                abi.decode(returndata, (bool)),
                "SafeERC20: ERC20 operation did not succeed"
            );
        }
    }
}

// import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/EnumerableSet.sol";
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value)
        private
        view
        returns (bool)
    {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index)
        private
        view
        returns (bytes32)
    {
        require(
            set._values.length > index,
            "EnumerableSet: index out of bounds"
        );
        return set._values[index];
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value)
        internal
        returns (bool)
    {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value)
        internal
        returns (bool)
    {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value)
        internal
        view
        returns (bool)
    {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index)
        internal
        view
        returns (bytes32)
    {
        return _at(set._inner, index);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value)
        internal
        returns (bool)
    {
        return _add(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value)
        internal
        returns (bool)
    {
        return _remove(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value)
        internal
        view
        returns (bool)
    {
        return _contains(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index)
        internal
        view
        returns (address)
    {
        return address(uint256(_at(set._inner, index)));
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value)
        internal
        returns (bool)
    {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value)
        internal
        view
        returns (bool)
    {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index)
        internal
        view
        returns (uint256)
    {
        return uint256(_at(set._inner, index));
    }
}

// import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol";
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/ReentrancyGuard.sol";
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// import "./AUTOToken.sol";
abstract contract AUTOToken is ERC20 {
    function mint(address _to, uint256 _amount) public virtual;
}

// For interacting with our own strategy
interface IStrategy {
    // Total want tokens managed by stratfegy
    function wantLockedTotal() external view returns (uint256);

    // Sum of all shares of users to wantLockedTotal
    function sharesTotal() external view returns (uint256);

    // Main want token compounding function
    function earn() external;

    // Transfer want tokens autoFarm -> strategy
    function deposit(address _userAddress, uint256 _wantAmt)
        external
        returns (uint256);

    // Transfer want tokens strategy -> autoFarm
    function withdraw(address _userAddress, uint256 _wantAmt)
        external
        returns (uint256);

    function inCaseTokensGetStuck(
        address _token,
        uint256 _amount,
        address _to
    ) external;
}

contract AutoFarmV2 is Ownable, ReentrancyGuard {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    // Info of each user.
    struct UserInfo {
        uint256 shares; // How many LP tokens the user has provided.
        uint256 rewardDebt; // Reward debt. See explanation below.

        // We do some fancy math here. Basically, any point in time, the amount of AUTO
        // entitled to a user but is pending to be distributed is:
        //
        //   amount = user.shares / sharesTotal * wantLockedTotal
        //   pending reward = (amount * pool.accAUTOPerShare) - user.rewardDebt
        //
        // Whenever a user deposits or withdraws want tokens to a pool. Here's what happens:
        //   1. The pool's `accAUTOPerShare` (and `lastRewardBlock`) gets updated.
        //   2. User receives the pending reward sent to his/her address.
        //   3. User's `amount` gets updated.
        //   4. User's `rewardDebt` gets updated.
    }

    struct PoolInfo {
        IERC20 want; // Address of the want token.
        uint256 allocPoint; // How many allocation points assigned to this pool. AUTO to distribute per block.
        uint256 lastRewardBlock; // Last block number that AUTO distribution occurs.
        uint256 accAUTOPerShare; // Accumulated AUTO per share, times 1e12. See below.
        address strat; // Strategy address that will auto compound want tokens
    }

    address public AUTO = 0x4508ABB72232271e452258530D4Ed799C685eccb; // 1:1 migration to AUTOv2
    address public AUTOv2 = 0xa184088a740c695E156F91f5cC086a06bb78b827;

    address public burnAddress = 0x000000000000000000000000000000000000dEaD;

    uint256 public ownerAUTOReward = 138; // 12%

    uint256 public AUTOMaxSupply = 80000e18;
    uint256 public AUTOPerBlock = 8000000000000000; // AUTO tokens created per block
    uint256 public startBlock = 3888888; //https://bscscan.com/block/countdown/3888888

    PoolInfo[] public poolInfo; // Info of each pool.
    mapping(uint256 => mapping(address => UserInfo)) public userInfo; // Info of each user that stakes LP tokens.
    uint256 public totalAllocPoint = 0; // Total allocation points. Must be the sum of all allocation points in all pools.

    event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
    event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
    event EmergencyWithdraw(
        address indexed user,
        uint256 indexed pid,
        uint256 amount
    );

    function poolLength() external view returns (uint256) {
        return poolInfo.length;
    }

    // Add a new lp to the pool. Can only be called by the owner.
    // XXX DO NOT add the same LP token more than once. Rewards will be messed up if you do. (Only if want tokens are stored here.)

    function add(
        uint256 _allocPoint,
        IERC20 _want,
        bool _withUpdate,
        address _strat
    ) public onlyOwner {
        if (_withUpdate) {
            massUpdatePools();
        }
        uint256 lastRewardBlock =
            block.number > startBlock ? block.number : startBlock;
        totalAllocPoint = totalAllocPoint.add(_allocPoint);
        poolInfo.push(
            PoolInfo({
                want: _want,
                allocPoint: _allocPoint,
                lastRewardBlock: lastRewardBlock,
                accAUTOPerShare: 0,
                strat: _strat
            })
        );
    }

    // Update the given pool's AUTO allocation point. Can only be called by the owner.
    function set(
        uint256 _pid,
        uint256 _allocPoint,
        bool _withUpdate
    ) public onlyOwner {
        if (_withUpdate) {
            massUpdatePools();
        }
        totalAllocPoint = totalAllocPoint.sub(poolInfo[_pid].allocPoint).add(
            _allocPoint
        );
        poolInfo[_pid].allocPoint = _allocPoint;
    }

    // Return reward multiplier over the given _from to _to block.
    function getMultiplier(uint256 _from, uint256 _to)
        public
        view
        returns (uint256)
    {
        if (IERC20(AUTOv2).totalSupply() >= AUTOMaxSupply) {
            return 0;
        }
        return _to.sub(_from);
    }

    // View function to see pending AUTO on frontend.
    function pendingAUTO(uint256 _pid, address _user)
        external
        view
        returns (uint256)
    {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][_user];
        uint256 accAUTOPerShare = pool.accAUTOPerShare;
        uint256 sharesTotal = IStrategy(pool.strat).sharesTotal();
        if (block.number > pool.lastRewardBlock && sharesTotal != 0) {
            uint256 multiplier =
                getMultiplier(pool.lastRewardBlock, block.number);
            uint256 AUTOReward =
                multiplier.mul(AUTOPerBlock).mul(pool.allocPoint).div(
                    totalAllocPoint
                );
            accAUTOPerShare = accAUTOPerShare.add(
                AUTOReward.mul(1e12).div(sharesTotal)
            );
        }
        return user.shares.mul(accAUTOPerShare).div(1e12).sub(user.rewardDebt);
    }

    // View function to see staked Want tokens on frontend.
    function stakedWantTokens(uint256 _pid, address _user)
        external
        view
        returns (uint256)
    {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][_user];

        uint256 sharesTotal = IStrategy(pool.strat).sharesTotal();
        uint256 wantLockedTotal =
            IStrategy(poolInfo[_pid].strat).wantLockedTotal();
        if (sharesTotal == 0) {
            return 0;
        }
        return user.shares.mul(wantLockedTotal).div(sharesTotal);
    }

    // Update reward variables for all pools. Be careful of gas spending!
    function massUpdatePools() public {
        uint256 length = poolInfo.length;
        for (uint256 pid = 0; pid < length; ++pid) {
            updatePool(pid);
        }
    }

    // Update reward variables of the given pool to be up-to-date.
    function updatePool(uint256 _pid) public {
        PoolInfo storage pool = poolInfo[_pid];
        if (block.number <= pool.lastRewardBlock) {
            return;
        }
        uint256 sharesTotal = IStrategy(pool.strat).sharesTotal();
        if (sharesTotal == 0) {
            pool.lastRewardBlock = block.number;
            return;
        }
        uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
        if (multiplier <= 0) {
            return;
        }
        uint256 AUTOReward =
            multiplier.mul(AUTOPerBlock).mul(pool.allocPoint).div(
                totalAllocPoint
            );

        AUTOToken(AUTOv2).mint(
            owner(),
            AUTOReward.mul(ownerAUTOReward).div(1000)
        );
        AUTOToken(AUTOv2).mint(address(this), AUTOReward);

        pool.accAUTOPerShare = pool.accAUTOPerShare.add(
            AUTOReward.mul(1e12).div(sharesTotal)
        );
        pool.lastRewardBlock = block.number;
    }

    // Want tokens moved from user -> AUTOFarm (AUTO allocation) -> Strat (compounding)
    function deposit(uint256 _pid, uint256 _wantAmt) public nonReentrant {
        updatePool(_pid);
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];

        if (user.shares > 0) {
            uint256 pending =
                user.shares.mul(pool.accAUTOPerShare).div(1e12).sub(
                    user.rewardDebt
                );
            if (pending > 0) {
                safeAUTOTransfer(msg.sender, pending);
            }
        }
        if (_wantAmt > 0) {
            pool.want.safeTransferFrom(
                address(msg.sender),
                address(this),
                _wantAmt
            );

            pool.want.safeIncreaseAllowance(pool.strat, _wantAmt);
            uint256 sharesAdded =
                IStrategy(poolInfo[_pid].strat).deposit(msg.sender, _wantAmt);
            user.shares = user.shares.add(sharesAdded);
        }
        user.rewardDebt = user.shares.mul(pool.accAUTOPerShare).div(1e12);
        emit Deposit(msg.sender, _pid, _wantAmt);
    }

    // Withdraw LP tokens from MasterChef.
    function withdraw(uint256 _pid, uint256 _wantAmt) public nonReentrant {
        updatePool(_pid);

        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];

        uint256 wantLockedTotal =
            IStrategy(poolInfo[_pid].strat).wantLockedTotal();
        uint256 sharesTotal = IStrategy(poolInfo[_pid].strat).sharesTotal();

        require(user.shares > 0, "user.shares is 0");
        require(sharesTotal > 0, "sharesTotal is 0");

        // Withdraw pending AUTO
        uint256 pending =
            user.shares.mul(pool.accAUTOPerShare).div(1e12).sub(
                user.rewardDebt
            );
        if (pending > 0) {
            safeAUTOTransfer(msg.sender, pending);
        }

        // Withdraw want tokens
        uint256 amount = user.shares.mul(wantLockedTotal).div(sharesTotal);
        if (_wantAmt > amount) {
            _wantAmt = amount;
        }
        if (_wantAmt > 0) {
            uint256 sharesRemoved =
                IStrategy(poolInfo[_pid].strat).withdraw(msg.sender, _wantAmt);

            if (sharesRemoved > user.shares) {
                user.shares = 0;
            } else {
                user.shares = user.shares.sub(sharesRemoved);
            }

            uint256 wantBal = IERC20(pool.want).balanceOf(address(this));
            if (wantBal < _wantAmt) {
                _wantAmt = wantBal;
            }
            pool.want.safeTransfer(address(msg.sender), _wantAmt);
        }
        user.rewardDebt = user.shares.mul(pool.accAUTOPerShare).div(1e12);
        emit Withdraw(msg.sender, _pid, _wantAmt);
    }

    function withdrawAll(uint256 _pid) public nonReentrant {
        withdraw(_pid, uint256(-1));
    }

    // Withdraw without caring about rewards. EMERGENCY ONLY.
    function emergencyWithdraw(uint256 _pid) public nonReentrant {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];

        uint256 wantLockedTotal =
            IStrategy(poolInfo[_pid].strat).wantLockedTotal();
        uint256 sharesTotal = IStrategy(poolInfo[_pid].strat).sharesTotal();
        uint256 amount = user.shares.mul(wantLockedTotal).div(sharesTotal);

        IStrategy(poolInfo[_pid].strat).withdraw(msg.sender, amount);

        pool.want.safeTransfer(address(msg.sender), amount);
        emit EmergencyWithdraw(msg.sender, _pid, amount);
        user.shares = 0;
        user.rewardDebt = 0;
    }

    // Safe AUTO transfer function, just in case if rounding error causes pool to not have enough
    function safeAUTOTransfer(address _to, uint256 _AUTOAmt) internal {
        uint256 AUTOBal = IERC20(AUTOv2).balanceOf(address(this));
        if (_AUTOAmt > AUTOBal) {
            IERC20(AUTOv2).transfer(_to, AUTOBal);
        } else {
            IERC20(AUTOv2).transfer(_to, _AUTOAmt);
        }
    }

    function inCaseTokensGetStuck(address _token, uint256 _amount)
        public
        onlyOwner
    {
        require(_token != AUTOv2, "!safe");
        IERC20(_token).safeTransfer(msg.sender, _amount);
    }

    function migrateToAUTOv2(uint256 _inputAmt) public {
        require(block.number < 5033333, "too late :("); // 20 Feb 2021 - https://bscscan.com/block/countdown/5033333
        IERC20(AUTO).safeIncreaseAllowance(burnAddress, _inputAmt);
        IERC20(AUTO).safeTransferFrom(
            address(msg.sender),
            burnAddress,
            _inputAmt
        );

        AUTOToken(AUTOv2).mint(msg.sender, _inputAmt);
    }
}

Contract Security Audit

Contract ABI

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"pid","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"pid","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"EmergencyWithdraw","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"pid","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdraw","type":"event"},{"inputs":[],"name":"AUTO","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"AUTOMaxSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"AUTOPerBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"AUTOv2","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_allocPoint","type":"uint256"},{"internalType":"contract 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IERC20","name":"want","type":"address"},{"internalType":"uint256","name":"allocPoint","type":"uint256"},{"internalType":"uint256","name":"lastRewardBlock","type":"uint256"},{"internalType":"uint256","name":"accAUTOPerShare","type":"uint256"},{"internalType":"address","name":"strat","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"poolLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"},{"internalType":"uint256","name":"_allocPoint","type":"uint256"},{"internalType":"bool","name":"_withUpdate","type":"bool"}],"name":"set","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"},{"internalType":"address","name":"_user","type":"address"}],"name":"stakedWantTokens","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"startBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalAllocPoint","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"}],"name":"updatePool","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"address","name":"","type":"address"}],"name":"userInfo","outputs":[{"internalType":"uint256","name":"shares","type":"uint256"},{"internalType":"uint256","name":"rewardDebt","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"},{"internalType":"uint256","name":"_wantAmt","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"}],"name":"withdrawAll","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

ipfs://1f1cbee4914c60b8ca60c2383184ce43532f22245a1023d0d35b14ac22bd1b61
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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