Fix link in thanks file

thanks-for-help.html

@@ -1814,7 +1814,7 @@ bugs.html</a> for details.</p>
 <p><a href="#cody">Cody</a> added the original file back as it was deemed that the export
 restrictions should no longer be a cause of concern for this entry. An entry
 that referred to this previous code was updated and the originally published
-code is now also in <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/nathan.alt.c">nathan.alt.c</a>. The astute
+code is now also in <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/nathan/nathan.alt.c">nathan.alt.c</a>. The astute
 viewer would note that it has the same typos as the originally published code.</p>
 <p>Cody cynically noted that if he goes quiet, for instance if he no longer
 participates in the IOCCC, that it must be our fault! :-)</p>