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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.
Both functions have the same functionality and end result, but I think my implemenation is more readable, making it easier to maintain and debug.
The use of the "for" loop makes the code more straightforward and eliminates the need for advanced string manipulation techniques, making it the better choice in my opinion.