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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.
Explane your problem, I can't see it. 21 people done this kata and no one got a problem with first sample test.
In which language?
maybe what you want is to compare srt.charAt(i) with 'o' and not 'y'?