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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.
Vulnerability for input mutation fixed.
Test for input mutation added.
Your solution is mutating the input array and as a consequence, the tests are misbehaving. It is indeed a kata issue because the tests should not be vulnerable to this, but at the same time your solution is not exactly correct: