智能合约USDT转入转出

智能合约USDT转入转出，简单逻辑 pragma solidity ^0.8.0; //引入USDT interface IERC20 { function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); function approve(address spender, uint256 amount) external returns (bool); function transfer(address to, uint256 amount) external returns (bool); function balanceOf(address account) external view returns (uint256); function allowance(address _owner, address spender) external view returns (uint256); } contract