To Lower Case
<p>Given a string <code>s</code>, return <em>the string after replacing every uppercase letter with the same lowercase letter</em>.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>

<pre>
<strong>Input:</strong> s = &quot;Hello&quot;
<strong>Output:</strong> &quot;hello&quot;
</pre>

<p><strong class="example">Example 2:</strong></p>

<pre>
<strong>Input:</strong> s = &quot;here&quot;
<strong>Output:</strong> &quot;here&quot;
</pre>

<p><strong class="example">Example 3:</strong></p>

<pre>
<strong>Input:</strong> s = &quot;LOVELY&quot;
<strong>Output:</strong> &quot;lovely&quot;
</pre>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>1 &lt;= s.length &lt;= 100</code></li>
	<li><code>s</code> consists of printable ASCII characters.</li>
</ul>
String
char* toLowerCase(char* s) {
    int n = strlen(s);
    for (int i = 0; i < n; i++) {
        if (s[i] >= 'A' && s[i] <= 'Z') {
            s[i] |= 32;
        }
    }
    return s;
}