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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.
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Issue with problem statement
There are inconsistencies between the problem description and the test cases.
The problem statement says, "The letters should be compared case-insensitive," but the tests only pass if the sorting is case-sensitive.
The the following sentence in the problem statement is redundant: "If both letters are the same, order them normally (lexicographically), again, case-insensitive". Lexicographical ordering already handles ties without needing a separate case-insensitivity clause.
Please clarify whether the sorting should be case-sensitive or case-insensitive.
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