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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's easy to fix.
I suggest adding test cases with more than one space between words.
I don't get it. It tells me that second test expects 23 as an answer, but when I give it 23, it tells me that 'Value is not what was expected'.