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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 test is ok, read the instructions again. The kata is not about reversing the chars, it's about reordering the digits to get the max posible number.
the expectation value in the 3rd test 1021 seems to be wrong or at least not matching with what the headline says. my program does get it correct and passes all other tests except this one.