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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.
(Using C++) had the same, my issue was the use of sizeof(inputStr) to get the lenght of the string. sizeof() only returns a maximal count of 32, if a string was longer thant 32 characters the test cases would fail. I then switched to inputStr.length() which ended up working fine. Hope that helps.