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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.
It works fine for me, what's the error message you're seeing?
Check the test code, please, it seems to be broken. Some issue with library imports. Also, correct solutions (even the ones copy-pasted from accepted solutions) don't work
Slightly lengthier than what could be done with string manipulation, but I don't like doing too much back-and-forth type-casting