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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.
After splitting the whole string check if the length of the last element in the array is 1. If it is then all you have to do is join an underscore with the last element.
You don't need to start counting from 1. Just look for the odd one, find it's index in the numbers array and increase it by 1.