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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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x
is a string, thereforex + 1
is also a string. instead of29 + 1 (=== 30)
you do'29' + '1' (=== '291')
even if you correct this, your approach wont work on large arrays, you should think of another algorithm (or another datatype)