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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 famous C++'s "Unsafe memory" ))
You iterating over string and in each iteration you checking whether the letter is in vowels. Resulting time complexity will be O(mn) where n is string length and m is number of vowels in alphabet. Sorry if I'm mistaken.
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Could've compile regex first
Bad time complexity
Time complexity is not cool)