tidy printing logic

[dmalan]

https://github.com/cs50/style50/blob/develop/style50/style50.py#L95-L124

Goal is to generate outputs below. Note deliberate blank lines for readability. Code has just gotten rather untidy.

[cmlsharp]

Definitely agree that the logic could use improvement. Unfortunately there are quite a few edge case to consider, but I'll work on collapsing as many of the conditionals as possible. In the meantime, I think we should merge #37.