A smart contract to track the contribution of different people

EthAjo.sol

/*

    A fallback function is a function that is called when someone calls a function that is not in the smart contract. The fall back function can also be used to recieve payment made to the contract.

*/

//SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

contract EthAjo {

    address public owner;
    mapping(address => uint) public balances;

    constructor() {
        owner = msg.sender;
    }

    function balanceOf(address _address) public view returns (uint) {
        return balances[_address];
    }


    function deposit() public payable returns (bool) {
        require(address(msg.sender).balance >= msg.value, "You do not have enough funds");
        (bool _success,) = payable(address(this)).call{value: msg.value}("");
        require(_success, "Deposit failed");
        balances[msg.sender] += msg.value;
        return _success;
    }

    function withdraw(uint _amount) public payable returns (bool) {
        require(balances[msg.sender] >= _amount, "You can not withdraw more than you have deposited");
        (bool _success,) = payable(address(msg.sender)).call{value: _amount}("");
        require(_success, "Withdrawal failed");
        balances[msg.sender] -= _amount;
        return _success;
    }

    receive () external payable {}
}