private static void SingletonPattern()
        {
            SingletonClassic singletonClassic = SingletonClassic.getInstance();

            Console.WriteLine(singletonClassic.getDescription());

            SingletonThreadSafe singletonThreadSafe = SingletonThreadSafe.getInstance();

            Console.WriteLine(singletonThreadSafe.getDescription());
        }
        public static void Run()
        {
            SingletonClassic.GetInstance().GetDescription();

            SingletonLazy.Lazy.Value.GetDescription();
        }