Drills tagged with this skill, unpassed first. Pass them all to mark the skill ready for scenarios.
to_titlecase(s) that returns s with the first letter of each word capitalized and the rest lowercase. Words are separated by single spaces.initials(name) that returns the initials of a name like "A.B.C.". Names are space-separated.clean_handle(s) that normalizes a username: strip leading/trailing whitespace, remove any @, lowercase, and replace spaces with underscores.