AI Attempt: The English List

ChatGPT was asked to write a function that formats an array of names into an English list (e.g. ['A', 'B', 'C'] -> 'A, B and C'). The function works perfectly the first time you call it. But the developer who used it noticed their data was disappearing.

When the developer runs `let team = ['Alice', 'Bob']; formatNames(team);`, the function returns 'Alice and Bob'. But if they check `team` afterwards, it is now just ['Alice'].