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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.
OP solved it, closing
Yup, i added a note now. Thank you!
This solution is actually supposed to pass. Strings in tests contain only unique characters from a to z, and many of people's solutions actually rely on this. They won't pass anymore if I change the tests.
Not an issue. Don't return the results of the previous tests together with the result of the current test.