Weth.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0 <0.9.0;
import "@rari-capital/solmate/src/tokens/ERC20.sol";
contract WETH is ERC20 {
    event Deposit(address indexed account, uint amount);
    event Withdraw(address indexed account, uint amount);
    constructor() ERC20 ("Wrapped Ether", "WETH", 18) {}

    fallback() external payable{
        deposit();
    }
    receive() external payable{}
    function deposit() public payable {
        _mint(msg.sender, msg.value);
        emit Deposit(msg.sender, msg.value);
    }
    function withdraw(uint _amount) external {
        _burn(msg.sender, _amount);
        payable(msg.sender).transfer(_amount);
        emit Withdraw(msg.sender, _amount);
    }
}