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<p>Write a function to find the longest common prefix string amongst an array of strings.</p>
<p>If there is no common prefix, return an empty string <code>&quot;&quot;</code>.</p>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<pre>
<strong>Input:</strong> strs = [&quot;flower&quot;,&quot;flow&quot;,&quot;flight&quot;]
<strong>Output:</strong> &quot;fl&quot;
</pre>
<p><strong>Example 2:</strong></p>
<pre>
<strong>Input:</strong> strs = [&quot;dog&quot;,&quot;racecar&quot;,&quot;car&quot;]
<strong>Output:</strong> &quot;&quot;
<strong>Explanation:</strong> There is no common prefix among the input strings.
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>1 &lt;= strs.length &lt;= 200</code></li>
<li><code>0 &lt;= strs[i].length &lt;= 200</code></li>
<li><code>strs[i]</code> consists of only lower-case English letters.</li>
</ul>