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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.
complete it that way too. it's quite intersting to know that we can compare strings by their unicode value
it turns out you can do the same without casting c to an int
Pro guy right here
validPhoneNumber('(not) t-oday')