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<p>Given a string <code>s</code>, reverse only all the vowels in the string and return it.</p>
<p>The vowels are <code>&#39;a&#39;</code>, <code>&#39;e&#39;</code>, <code>&#39;i&#39;</code>, <code>&#39;o&#39;</code>, and <code>&#39;u&#39;</code>, and they can appear in both cases.</p>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<pre><strong>Input:</strong> s = "hello"
<strong>Output:</strong> "holle"
</pre><p><strong>Example 2:</strong></p>
<pre><strong>Input:</strong> s = "leetcode"
<strong>Output:</strong> "leotcede"
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>1 &lt;= s.length &lt;= 3 * 10<sup>5</sup></code></li>
<li><code>s</code> consist of <strong>printable ASCII</strong> characters.</li>
</ul>