static void Main(string[] args)
        {
            var arr = new[] { 12, 11, 13, 5, 6, 7 };

            printArray(arr);
            Quick.Sort(arr);
            printArray(arr);
        }
        public static void Sort <T>(T[] array) where T : IComparable
        {
            KnuthShuffle(array);

            Quick.Sort(array, 0, array.Length - 1);
        }