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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.
As said before, test cases should be added so that failing tests are not misleading anymore.
I had some issue with 'whitespaces' removal as well, but this is maybe more a problem with my coding rather than a kata issue.
Anyway, that's a great kata!