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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.
You wrong, because string VOWELS is of constant length (5) and does not depend on an input. So it will be O(n*const) = O(n).
You should not modify the original string. The function definition const declares the input arg, which you removed..
super!
This is beautiful.