Ethernaut Level 22: Dex

Solidity Code // SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import '@openzeppelin/contracts/math/SafeMath.sol'; import '@openz...