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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 kata expects the function to return a string of
"Invalid input"when the input is invalid, not terminating the script entirely.I code on PHP, i just don't understanding why it fails in logic section, it doesn't even saying why it fails it just saying "Invalid input" so i don't even getting where it fails, when i run every unit test in my ide everything work fine but when i attempt it fails for some reason, so plz take a look.