NumberKeeper contract

NumberKeeper.sol

// SPDX-License-Idenfitier: UNLICENSED
pragma solidity ^0.8.0;

contract NumberKeeper {
    int magicNumber;
    mapping (address => bool) public isAuthorized;

    event NumberChanged(int indexed newNumber);

    constructor() {
        isAuthorized[msg.sender] = true;
    }

    function setNumber (int newNumber) public {
        require(isAuthorized[msg.sender] == true, "Not authorized to change");
        magicNumber = newNumber;
        emit NumberChanged(newNumber);
    }

    function getNumber () public view returns(int) {
        return magicNumber;
    }

    function checkAccess (address authAddress) public view returns(bool) {
        return isAuthorized[authAddress];
    }

    function changeAccess (address newAddress, bool isGranted) public {
        require(isAuthorized[msg.sender] == true, "Not authorized to change");
        isAuthorized[newAddress] = isGranted;
    }
}