Loading collection data...
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 example if word was "hello" then the function would return "helloay" because it is concatenating them with return word + "ay"
join() function joins the elements of the list (in this case ans) together using the string (in this case empty string ''), while lower() changes all characters to lower case.