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345. Reverse Vowels of a String
Description
Given a string s, reverse only all the vowels in the string and return it.
The vowels are 'a', 'e', 'i', 'o', and 'u', and they can appear in both cases.
Example 1:
Input: s = "hello" Output: "holle"
Example 2:
Input: s = "leetcode" Output: "leotcede"
Constraints:
1 <= s.length <= 3 * 105sconsist of printable ASCII characters.