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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.
I dont understand how the answer is codewarsxxxx. For the 1st and 2nd index(0 index strings), the number of strikes would be 7 and 6, respectively. Hence, '9' and '6' in reinforces[0] will be replaced by 'a' and 'a', respectively giving caaewarsxxxx as the result. What am I missing?