Have parts use Result instead of Option

[ahenshaw]

Would it be better to return a Result instead of an Option for the parts? Given the nature of the puzzles, we should be generating either a value or an error. Plus, I'd like to replace all of my unwraps with "?"s.

[fspoettel]

I'd like to replace all of my unwraps with "?"s

You can append .ok() to results to cast them to an option, then your ? will work.