Fix typo and format package.json

[darpr]

Description of changes

Noticed a typo in challenge.js. Fixed it. Along the way, formatted package.json & challenge.js.

Issue Resolved

Fixes #

[kylemh]

Wow! Thanks so much for your contribution. It means the world to us here at Operation Code.

We're not really supporting this repository, but challenge hasn't been done yet and will inevitably be copy-pasted, so your work here is preventative for us.

As a token of our gratitude, please fill out this form to receive some stickers and a handwritten "thank you" note. ❤️

[darpr]

Thanks @kylemh!