Logic fixes and refactoring

[KayDee]

[rawr51919]

@KayDee, line 180/197 is actually cleaner how it is right now in master than it is in your PR, as

lastSymbol += word[word.length - 1]; === lastSymbol = word[word.length - 1] + lastSymbol;

I'd like for you to undo that change you put on that line.