public static void Main()
        {
            CopyConstructor cp1 = new CopyConstructor("June", 2018);
            CopyConstructor cp2 = new CopyConstructor(cp1);

            Console.WriteLine(cp2.Details);
        }
 public CopyConstructor(CopyConstructor c)
 {
     month = c.month;
     year  = c.year;
 }