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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'm successfully reversing the strings, but it looks like the expected count is off. For example, for 'hello world' N=11. When I submit, the test shows expected as 12 and actual as 11.