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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.
The tests are fine, your function is returning a wrong answer. It's failing the second sample test, check your code.
'650 ...' should equal '65 ...' are clearly different. I think your code needs some work.
Those strings seem not to be the same. So you are not passing the tests.