ret value declare but unused 

There is a value called `ret` declared [here](https://github.com/heineman/python-data-structures/blob/1de93ca99ba564b2ba13113cb3be6855eec8d2d5/4.%20Recursive%20Structures/projectBinaryCounting.py#L136) but I am not sure exactly how it should be used considering its name. 

Great course btw George. Keep up the great work sir! 🙂 👍 