Haskell Monads - The Maybe Monad

This topic is for the [The Maybe Monad] exercise in the [Haskell Monads] trail. Post any questions, corrections, or pointers you have to share with other Upcase subscribers.
[The Maybe Monad]: https://exercises.upcase.com/exercises/the-maybe-monad
[Haskell Monads]: Haskell Monads | Online Tutorial by thoughtbot