emoji_eventsWord frequency report

Write top_words(text, k) that returns the k most common words as a list of (word, count) tuples.

• Words are compared case-insensitively and returned in lowercase.
• Ignore punctuation: "Hello, hello!" counts hello twice.
• Sort by count (highest first); break ties alphabetically.

Acceptance criteria

• Handles an empty string (returns []).
• The tests at the bottom print All tests passed.

Hint: re.findall(r"[a-z']+", text.lower()) and collections.Counter.