You are given an array of strings text. For each word that starts and ends with a vowel (case-insensitive: a, e, i, o, u), reverse the substring between its first and last character, keeping the first and last characters in place. Words that do not start and end with a vowel remain unchanged.

A word of length 1 or 2 that starts and ends with a vowel has no middle characters to reverse and is returned unchanged. ...