pragma solidity ^0.8.7; // SPDX-License-Identifier: MIT contract MoneyCollector { // address public owner; uint256 public balance; constructor() { owner = msg.sender; // store information who deployed contract } receive() payable external { balance += msg.value; // keep track of balance (in WEI) } function withdraw(uint amount, address payable destAddr) public { require(msg.sender == owner, "Only owner can withdraw"); require(amount <= balance, "Insufficient funds"); destAddr.transfer(amount); // send funds to given address balance -= amount; } } } 0.7.1