public void Undo(GameOriginator gameOriginator)
{
IMemento lastMemento = mementos.Last();
mementos.Remove(lastMemento);
gameOriginator.RestoreGame(lastMemento);
}
static void Main(string[] args)
{
GameOriginator gameOriginator = new GameOriginator(new GameState(0, "Silp", DateTime.Now));
GameCaretaker caretaker = new GameCaretaker();
continueWithKey();
caretaker.MakeBackup(gameOriginator.Save());
gameOriginator.NextLevel();
continueWithKey();
caretaker.MakeBackup(gameOriginator.Save());
gameOriginator.NextLevel();
gameOriginator.NextLevel();
gameOriginator.NextLevel();
gameOriginator.DescribeCurrentLevel();
caretaker.ShowHistory();
Console.WriteLine("Making undo");
continueWithKey();
caretaker.Undo(gameOriginator);
Console.WriteLine("Making another undo");
continueWithKey();
caretaker.Undo(gameOriginator);
caretaker.ShowHistory();
continueWithKey();
}