Хранитель (Memento)

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Linq;
using System.Threading.Tasks;

class Program
{
   static void Main(string[] args)
   {
    Hero hero = new Hero();
    hero.Shoot();
    GameHistory game = new GameHistory();
    game.History.Push(hero.SaveState());
    hero.Shoot();
    hero.RestoreState(game.History.Pop());
    hero.Shoot();

    Console.ReadLine();
   }
}

class Hero
{
    private int patrons = 10;
    private int lavel = 5;

    public void Shoot()
    {
        if(patrons > 0)
        {
            patrons--;
            Console.WriteLine("Производим выстрел. Патронов осталось {0}", patrons);
        }
        else{
            Console.WriteLine("Патронов больше нет");
        }
    }

    public HeroMomento SaveState()
    {
        Console.WriteLine("Сохранение игры. Патронов: {0} Жизней: {1}", patrons, lavel);
        return new HeroMomento(patrons, lavel);
    }

    public void RestoreState(HeroMomento momento)
    {
        this.patrons = momento.Patrons;
        this.lavel = momento.Lavel;
        Console.WriteLine("Востановление. Патронов {0} Жизней {1}", patrons, lavel);
    }
}

class HeroMomento
{
    public int Patrons{get; private set;}
    public int Lavel{get; private set;}

    public HeroMomento(int patrons, int lavel)
    {
        Patrons = patrons;
        Lavel = lavel;
    }
}

class GameHistory
{
    public Stack<HeroMomento> History {get; private set;}
    public GameHistory()
    {
        History = new Stack<HeroMomento>();
    }
}