# Objective I can write a recursive function that works on a string. --- # LetterSwap `(swap "wallaby" "a" "x")` `=> "wxllxby"` `swap: word original replace -> string` Change the letter `original` to the letter `replace` in the `word`. --- # No Mistakes `no-mistake: string(word) -> string` Remove every appearance of "mistake" inside the given word.