Balance and address checker

checker.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.7.0;

contract Checker {
    address owner;
    
    constructor() {
        owner = msg.sender;    
    }
    
    function getBalanceOfContract() public view returns(uint) {
        return address(this).balance;
    }
    
    function getBalanceOfOwner() public view returns(uint){
        if(msg.sender == owner) 
             return owner.balance;
        else return 0;
    }
    
    function getBalanceOfSender() public view returns(uint) {
        return msg.sender.balance;
    }
    
    function getAddressOfContract() public view returns(address) {
        return address(this);
    }
   
    function getAddressOfOwner() public view returns(address) {
        return owner;    
    }
     
    function getAddressOfSender() public view returns(address) {
        return msg.sender;
    }
}