Serve Five

The kitchen prepped exactly k trays — serve that many, then close. 🍽️

You get the line (front first) and the number k (never more than the line's length). Serve k people and print who's still waiting, comma-separated, or all served.

Example:

Input: line = ["mia", "leo", "kai", "ana", "bo"], k = 3 Output: ana,bo

Serving 3 people removes mia, leo, and kai from the front, leaving ana and bo still waiting.