Complete the body of the printWithCommas static method. This method outputs the given NaturalNumber to an output stream, inserting a comma before every group of three digits (from right to left). So the number 12345678 would be printed as 12,345,678. For this method you can use any of the NaturalNumber methods. Note that the contract for this method states (implicitly) that the value of the given NaturalNumber must be restored so that the outgoing value of n is the same as the incoming value.