public static void Main(String[] args)
        {
            DoubleSpring ds = new DoubleSpring();

            Console.WriteLine("Enter Name-");
            var input = Console.ReadLine();

            ds.Expand(input);
            Console.WriteLine("Enter Name-");
            input = Console.ReadLine();
            ds.Expand(input);
            Console.WriteLine("Enter Name-");
            input = Console.ReadLine();
            ds.Expand(input);
            Console.WriteLine("Enter Name-");
            input = Console.ReadLine();
            ds.Expand(input);
            Console.WriteLine("Enter Name-");
            input = Console.ReadLine();
            ds.Expand(input);
            Console.WriteLine($"No of Elements-{ds.Count()}");
            foreach (var i in ds)
            {
                Console.WriteLine(i);
                Console.WriteLine("-------------");
            }
            ds.Compress();
            Console.WriteLine($"No of Elements-{ds.Count()}");
            foreach (var j in ds)
            {
                Console.WriteLine(j);
                Console.WriteLine("-------------");
            }
        }
 public bool MoveNext()
 {
     if (index++ <= DS.Count())
     {
         item = DS[index];
         return(true);
     }
     else
     {
         return(false);
     }
 }