Improve repository readability and documentation

[ndd7xv]

As per this feedback,

• Give more spacing between functions
• Add comments to generate rustdoc
• Add additional comments on obscure code

I'm extending this beyond the listed recommendations because the suggestions are a part of the bigger idea to make this repo understandable - if there's anything that needs to be changed (or you think should be added) in the README, typos in a comment, or a refactoring of unidiomatic/messy code, those changes (whether they be in a different PR or not) are welcome to reference this issue.