Write a complete method from the client perspective that duplicates each element in place in a ListInterface object. For example, if the list contained (1, 2, 3), after invoking the method, the list would contains (1, 1, 2, 2, 3, 3). See the tester program for more examples. Notes: For full credit, do not create another list (or any data structure) inside the method. Only modify the parameter list. Not creating another data structure is worth 10 out of the 20 points. This question will not be scored based on efficiency (big-O). The method header is: public static void addDuplicateNeighbors(ListInterface list)