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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.
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Probably because the control function is called after yours and with an empty string as input, an empty string is the expected result too.
Are you somehow destroying the input value? Strings are mutable in Ruby.