Solve Exercise • E16.4 recursively by calling a recursive helper method

If start is null, then the size is 0. Otherwise, it is one larger than the size of start.next.

Data from exercise  E16.4 Add a method size to our implementation of the LinkedList class that computes the number of elements in the list by following links and counting the elements until the end of the list is reached.

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private static int size (Node start)