TERRIBLE variable names in this project

[1j01]

Inconsistent styling, and unpleasant to work with because I can't tell what things are just by looking at them
For instance I got tripped up by the difference between str and s, which are both abbreviations of the word "string", but one of which is a GuitarString and one of which is a number (an index into the array of guitar strings). Neither are strings, which is funny, but, ay-ai-ai, not good, not good stuff

[1j01]

Also I should move the source files to a folder, and set up auto formatting

and update dependencies