EtherStore.sol

pragma solidity 0.8.21;

//vulnerable contract, do not use
contract EtherStore {
    mapping(address => uint256) public balances;

    constructor() payable {
        require(msg.value == 1 ether);
    }

    function deposit() public payable {
        balances[msg.sender] += msg.value;
    }

    function withdraw() public {
        uint256 bal = balances[msg.sender];
        require(bal > 0, "no balance");

        (bool sent, ) = payable(msg.sender).call{value: bal}("");
        require(sent, "failed to send ether");

        balances[msg.sender] = 0;
    }

}