in the input <code class="docutils literal notranslate"><span class="pre">&lt;string&gt;</span></code> to its hexadecimal representation
and store the concatenated hex digits in the <code class="docutils literal notranslate"><span class="pre">&lt;output_variable&gt;</span></code>. Letters in
the output (<code class="docutils literal notranslate"><span class="pre">a</span></code> through <code class="docutils literal notranslate"><span class="pre">f</span></code>) are in lowercase.</p>
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