inheritance.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0;
 
// Defining parent contract 
contract School { 
 
    // Declaring variable in the parent contract 
  
    string public school = "Shmorse School of Solidity"; 
    
    // Saves address of the wallet that deployed the contract 
    // Can be used in the future
    
    address private _owner; 

    constructor (){
        _owner = msg.sender; 
    }
} 

// Defining child contract that inherits from parent 

contract Pupil is School{
   
   // Name of a pupil 
   string public name; 

   constructor (string memory name_){
       name = name_;
   }
   
   // Solidity does not like strings
   // But we use it for simplicity 
   function concatenate() public view returns (string memory){
        return string(abi.encodePacked(name,' studies at ',school));
    } 
}