/span>
    (<span class="kw">string-append</span> s1 s2)               <span class="co">; append s2 to s1</span>

    (<span class="kw">string=?</span> s1 s2)                    <span class="co">; #t if the strings are the same</span>

    (<span class="kw">string-ref</span> s n)                    <span class="co">; get nth character from string (0 based)</span>
    (<span class="kw">string-set!</span> s n c)                 <span class="co">; get nth character in string (0 based) to character</span>

    