ATMMachine.sol

//SPDX-License-Identifier:MIT
pragma solidity 0.8.5;

contract ATMMachine {
    // this is the reserve of the atm machine
    address public owner;

    constructor () {
        owner = msg.sender;
    }

    mapping (address => uint) public userBal;

    modifier onlyOwner() {
        require (msg.sender == owner, 'Not the owner');
        _;
    }

    function deposit (address addr, uint amt) onlyOwner payable public {
        userBal[addr] = amt;
    }

    function withdrawl (uint _amt) public payable {
        require(userBal[msg.sender] >= _amt, 'you cannot withdrawl more than you have');
        require(_amt <= address(this).balance, 'Temporally unable to dispense cash');
        userBal[msg.sender] -= _amt;
        payable(msg.sender).transfer(_amt);
    }

    function constractBal() public view returns(uint){
        return address(this).balance;
    }
}

//10000000000000000000