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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.
Thanks ;-)
The strings that tests expect are all simple and without caveats.
The strings that your functions return you may print yourself in whatever way that looks appropriate to you. You may even print them as hexlified bytes. I would consider it a part of the kata. :)