reverse-string.md

<p>Write a function that reverses a string. The input string is given as an array of characters <code>char[]</code>.</p>

<p>Do not allocate extra space for another array, you must do this by <strong>modifying the input array&nbsp;<a href="https://en.wikipedia.org/wiki/In-place_algorithm" target="_blank">in-place</a></strong> with O(1) extra memory.</p>

<p>You may assume all the characters consist of <a href="https://en.wikipedia.org/wiki/ASCII#Printable_characters" target="_blank">printable ascii characters</a>.</p>

<p>&nbsp;</p>

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<p><strong>Example 1:</strong></p>

<pre>
<strong>Input: </strong><span id="example-input-1-1">[&quot;h&quot;,&quot;e&quot;,&quot;l&quot;,&quot;l&quot;,&quot;o&quot;]</span>
<strong>Output: </strong><span id="example-output-1">[&quot;o&quot;,&quot;l&quot;,&quot;l&quot;,&quot;e&quot;,&quot;h&quot;]</span>
</pre>

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<p><strong>Example 2:</strong></p>

<pre>
<strong>Input: </strong><span id="example-input-2-1">[&quot;H&quot;,&quot;a&quot;,&quot;n&quot;,&quot;n&quot;,&quot;a&quot;,&quot;h&quot;]</span>
<strong>Output: </strong><span id="example-output-2">[&quot;h&quot;,&quot;a&quot;,&quot;n&quot;,&quot;n&quot;,&quot;a&quot;,&quot;H&quot;]</span>
</pre>
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