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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.
For C++. I used std::stoi (int) and resolved the kata. After click submit I realized I should return 'long long'. I suggest add some additional test cases for checking proper type :)
Adjust details to handle whitespace characters and punctuation
Random tests
Solved it with recursion!
As others said, there should be more sample test cases with special characters (thinking about the point in the really last test).
Need random tests!
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There are more than a few palindrome katas already: