class Memento public string State get private set public Memento strin

class Memento
{
    public string State { get; private set;}
    public Memento(string state)
    {
        this.State = state;
    }
}
 
class Caretaker
{
    public Memento Memento { get; set; }
}
 
class Originator
{
    public string State { get; set; }
    public void SetMemento(Memento memento)
    {
        State = memento.State;
    }
    public Memento CreateMemento()
    {
        return new Memento(State);
    }
}