.</li>
</ul>

<p>Your eventual goal is to implement the function:</p>

<p class="text-center"><code class="language-c++ highlighter-rouge"><span class="n">string</span> <span class="n">soundex</span><span class="p">(</span><span class="n">string</span> <span class="n">s</span><span class="p">)</span></code></p>

<p>The top-level function will use the helper functions that you have written and tested. In addition to the test cases for the individual helper functions, you will also need test cases for the top