Consider the method reverse (as defined below), which reverses the digit of a given NaturalNumber . For example, if the initial value of n is 346, after it will be 643. /** * Reverses the digits in NaturalNumber n. * * @updates n * @requires [none of the digits in n is 0] * @ensures n = [#n with its digits reversed] */ private static void reverse(NaturalNumber n) { } 1. Implement this method without using recursion. You can only use kernel methods (including Standard methods), and you are not allowed to use any other reference types besides NaturalNumber (so no arrays, Strings, etc.). 2. Implement this methods using recursion. You may use non-kernel methods, but you are still restricted from using any other reference types besides NaturalNumber . You may write additional helper methods that you can call inside your implementation, but they must obey all the same restrictions above. If you write helper methods, include full JavaDoc contracts for them.