o_upper</span>(dog)</span>
<span id="cb26-13"><a href="#cb26-13" tabindex="-1"></a><span class="co">#&gt; [1] &quot;THE QUICK BROWN DOG&quot;</span></span>
<span id="cb26-14"><a href="#cb26-14" tabindex="-1"></a><span class="fu">str_to_lower</span>(dog)</span>
<span id="cb26-15"><a href="#cb26-15" tabindex="-1"></a><span class="co">#&gt; [1] &quot;the quick brown dog&quot;</span></span>
<span id="cb26-16"><a href="#cb26-16" tabindex="-1"></a><span class="fu">str_to_title</span>(dog)</span>
<span id="cb26-17