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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.
While the example shows the spaces, the description itself still doesn't say anything about a separation by whitespace, so there's a mismatch between the exercise and the wanted solution.
Suggestion
Thanks for the spot, its been updated
Check again. Issue should be fixed, I have provided an example string from the provided (example) test cases.