emoji_eventsSlugify a title

Write slugify(title) that turns a page title into a URL slug, like the ones PandaDev uses for tracks and posts.

• Lowercase; letters and digits only, separated by single hyphens.
• Accented letters lose their accents: "Café Crème" becomes "cafe-creme".
• No hyphens at the start or end.

Acceptance criteria

• slugify(" Hello, World! ") returns "hello-world".
• The tests at the bottom print All tests passed.

Hint: unicodedata.normalize("NFKD", ...) splits letters from their accents.