Who Improved the Most?

Everyone ran the race twice this season — who shaved off... no wait, who ADDED the most points? 📈

You get names, their before scores, and their after scores (three matching lines, one clear winner). Print the name of the biggest improver.

Example:

Input: names = ["mia", "leo", "kai"], before = [10, 40, 20], after = [30, 45, 50] Output: kai

The improvements are 20, 5, 30 — kai's jump of 30 is the biggest.