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<p>You are given a string <code>s</code> consisting of lowercase English letters. A <strong>duplicate removal</strong> consists of choosing two <strong>adjacent</strong> and <strong>equal</strong> letters and removing them.</p>
<p>We repeatedly make <strong>duplicate removals</strong> on <code>s</code> until we no longer can.</p>
<p>Return <em>the final string after all such duplicate removals have been made</em>. It can be proven that the answer is <strong>unique</strong>.</p>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<pre>
<strong>Input:</strong> s = &quot;abbaca&quot;
<strong>Output:</strong> &quot;ca&quot;
<strong>Explanation:</strong>
For example, in &quot;abbaca&quot; we could remove &quot;bb&quot; since the letters are adjacent and equal, and this is the only possible move. The result of this move is that the string is &quot;aaca&quot;, of which only &quot;aa&quot; is possible, so the final string is &quot;ca&quot;.
</pre>
<p><strong>Example 2:</strong></p>
<pre>
<strong>Input:</strong> s = &quot;azxxzy&quot;
<strong>Output:</strong> &quot;ay&quot;
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>1 &lt;= s.length &lt;= 10<sup>5</sup></code></li>
<li><code>s</code> consists of lowercase English letters.</li>
</ul>