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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Don't give up - took me a day or so spread across multiple tries to figure it out!
I know...I have to admit, that I didn't read the description very well. I planned to fix it later on, but forgot.
Thanks for reminding me, I'm trying again right now!
You've implemented foldl from ground up rather than using foldr in a cool way. Try doing that instead as the kata asks.