Authored by Ryan Skonnord. Inspired by the post at https://redd.it/v6c0f3 by u/mhmhbetter1.
This program solves a word puzzle where the goal is to turn one word for another by exchanging one letter at a time, with all intermediate steps being valid words.
Running the program requires a list of valid words in the puzzle's language.
Such a list can be found at https://github.com/dwyl/english-words or locally on
a Unix system at /usr/share/dict/words.