You are required to come up with a single header file (intlist. h) that declares and implements the intnode class (just copy it exactly as it is below) as well as declares the intlist class interface only. you are also required to come up with a separate implementation file (intlist. cpp) that implements the member functions of the intlist class. while developing your intlist class you must write your own test harness (within a file named main. cpp). never implement more than 1 or 2 member functions without fully testing them with your own test harness.