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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.
As the input may have trailing spaces, you will also need to ignore unneccesary whitespace.
string not trim()?
"break" is not needed when "return" is used.
I think checking the length of array with count($arr) on every loop step is bad practice. Use variable to hold array length and assign value to it before cycle starts.