append

  Write a static method called append that takes two
   integer arrays as parameters and that returns a new array that contains the
   result of appending the values of the second array at the end of the first
   array.  For example, suppose that arrays list1 and list2 have been declared
   as follows:

        int[] list1 = {2, 4, 6};
	int[] list2 = {1, 2, 3, 4, 5};

   If we make the following call:

        append(list1, list2)

   The method will return a new array that contains the following values:

        [2, 4, 6, 1, 2, 3, 4, 5]

   If the call instead had been:

        append(list2, list1)

   Then the method would return a new array that contains:

        [1, 2, 3, 4, 5, 2, 4, 6]

   Your method should not change either of the arrays passed as parameters.