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Destroyable.sol

pragma solidity 0.5.12;

contract Destroyable{
    
}

HelloWorld.sol

import "./Ownable.sol";
import "./Destroyable.sol";
pragma solidity 0.5.12;


contract HelloWorld is Ownable, Destroyable{

    struct Person {
      uint id;
      string name;
      uint age;
      uint height;
      bool senior;
    }

    event personCreated(string name, bool senior);
    event personDeleted(string name, bool senior, address deletedBy);
     //Create an event called PersonUpdated that is emitted when a persons information is updated. The event should contain both the old and the updated information of the person. 
    event PersonUpdated(string nameold, string name, uint ageold, uint age, uint heightold, uint height) ;

    uint public balance;

    modifier costs(uint cost) {
        require(msg.value >= cost);
        _; //Continue execution        
    }



    mapping (address => Person) private people;
    address[] private creators;

    function createPerson(string memory name, uint age, uint height) public payable costs(1 ether) {
        require(age < 150, "Age needs to be below 150");
        balance += msg.value;
        //This creates a person
        Person memory newPerson;
        newPerson.name = name;
        newPerson.age = age;
        newPerson.height = height;

        if(age >= 65){
           newPerson.senior = true;
       }
       else{
           newPerson.senior = false;
       }

        insertPerson(newPerson);
        creators.push(msg.sender);

        assert(
            keccak256(
                abi.encodePacked(
                    people[msg.sender].name,
                    people[msg.sender].age,
                    people[msg.sender].height,
                    people[msg.sender].senior
                )
            )
            ==
            keccak256(
                abi.encodePacked(
                    newPerson.name,
                    newPerson.age,
                    newPerson.height,
                    newPerson.senior
                )
            )
        );
        emit personCreated(newPerson.name, newPerson.senior);
    }
    function insertPerson(Person memory newPerson) private {
        address creator = msg.sender;
        people[creator] = newPerson;
    }
    function getPerson() public view returns(string memory name, uint age, uint height, bool senior){
        address creator = msg.sender;
        return (people[creator].name, people[creator].age, people[creator].height, people[creator].senior);
    }
    function deletePerson(address creator) public onlyOwner {
      string memory name = people[creator].name;
      bool senior = people[creator].senior;

       delete people[creator];
       assert(people[creator].age == 0);
       emit personDeleted(name, senior, owner);
   }
   function getCreator(uint index) public view onlyOwner returns(address){
       return creators[index];
   }

   function withdrawAll() public onlyOwner returns(uint) {
       uint toTransfer = balance;
       balance = 0;
       msg.sender.transfer(toTransfer);
   }
  

}

Ownable.sol

pragma solidity 0.5.12;

contract Ownable{

    address public owner;

    modifier onlyOwner(){
        require(msg.sender == owner);
        _; //Continue execution
    }
    
    constructor() public{
        owner = msg.sender;
    }

}