namespace MementoPattern;

public class Caretaker
{
   //container that could hold memento of Originator
   //object
   private readonly Stack<IMemento> _mementos = new();
   private readonly IOriginator _originator;

   public Caretaker(IOriginator originator)
   {
      _originator = originator;
   }

   public void Save()
   {
      _mementos.Push(_originator.GetMemento());
   }

   public void Undo()
   {
      _originator.SetMemento(_mementos.Pop());
   }
}