static public void Run()
{
Console.WriteLine("------------Memento------------");
ComputerSystem computerSystem = new ComputerSystem("4.12");
SystemHistory history = new SystemHistory();
history.Points.Push(computerSystem.CreateSystemPoint());
computerSystem.Version = "5.01";
Console.WriteLine("New Version: " + computerSystem.Version);
computerSystem.RestoreSystem(history.Points.Pop());
Console.WriteLine("Version after restore: " + computerSystem.Version);
}