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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.
Test cases are considering just words with ASCII codes, to force developers take care abaut UTF8 (default go character encoding) maybe a good idea to include word like "ддрво" => "дрво" (tree in Serbian)
This solution just works for ascii characters, not for uft8 (default go characters enconding). For example, the resulting string for "ддрво" should be "дрво" (Serbian word for "tree")