Kristen Mesler Pull Request

I think that the 'front' variable is still set from using the second tester method and it is affecting the second to last tester method. I couldn't figure out a way to fix this issue but is does run to a certain point. It will give the print statements and and error will pop up. You can close the error and still look at my output to all of the methods except for the last two.
Also, we don't need front any more because the stack won't ever need to be circular.