code> function are guaranteed to contain at least one letter character. This means you do not have to make a special case in <code class="language-c++ highlighter-rouge"><span class="n">soundex</span></code> to handle a string that doesn't any letters at all (e.g. no empty string or string containing only digits or punctuation).</li>
</ul>

<h2 id="useful-resources">Useful resources</h2>
<ul>
  <li>On the Qt Creator window, there is search field in the lower left labeled with a magnifying glass icon.  If yo