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contracts...Inheritance.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0 <0.9.0;

contract MainContract {

    uint public value;

    constructor (uint amount) {
        value = amount;
    }

    function deposit (uint amount) public {
        value += amount;
    }

    function withdraw (uint amount) public {
        value -= amount;
    }
}

interface ContractInterface {
    function sendMoney (uint amount, address payable _address) external returns (bool);
}

// This will give an error...since baseContract has a constructor that we need to initialize
// contract myContract is baseContract, interfaceContract {

contract InheritanceContract is  ContractInterface, MainContract(100) {

    string public contractName;

    uint public balanceReceived;

    constructor (string memory _n)  {
        contractName = _n;
    }
    function getValue () public view returns (uint) {
        //value comes from inerited contract
        return value;
    }

    // This function has to be implemented, since it is unimplemented in the interfaceContract
    function sendMoney (uint amount, address payable _address) public override returns (bool) {
        address payable to = payable(_address);
        to.transfer(amount);
        return true;
    }

    function payContractMoney() public payable {
        balanceReceived += msg.value;
    }

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

    function withdrawMoney() public {
        address payable to = payable(msg.sender);
        to.transfer(getBalance());
    }
}