Numbered Menu, switch statement, and stupidity checker

Added a numbered menu (needed practice for my program for Intro to C), a
switch statement to work with the menu (Will, I don't know if your Intro
to C class has covered this yet, so I would be willing to explain it if
you want), and a stupidity checker function because it wouldn't be a
shitty c game if it didn't criticize the user at least once.

Also, I left the improper structure of the if statement for Will to fix.
It's a good opportunity to learn.