Good to know. Thanks!

It should be noted that len(String) counts the number of bytes in a string. In a real-world application you might want to use utf8.RuneCountInString.

Source: https://stackoverflow.com/questions/12668681/how-to-get-the-number-of-characters-in-a-string

Just so you know, String#chars is way faster than String#split, and is all we need for this challenge!