EthereumWallet.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

contract EthereumWallet {

    address owner;

    constructor() {
        owner = msg.sender;
    }

    modifier onlyOwner() {
        require(msg.sender == owner, "requires only owner");
        _;
    }

    function deposit() external payable {
        require(msg.value > 0, "can't send zero value");
    }

    function withdraw(uint _amount) external onlyOwner {
        require(address(this).balance >= _amount, "insufficient fund");
        payable(msg.sender).transfer(_amount);
    }

    function getWalletBalance() external view returns (uint bal) {
        bal = address(this).balance;
    }

    receive() external payable {}
    fallback() external payable {}
}