Restore 2006/grothe/olympic.txt

Updated manifest, rebuilt .entry.json and index.html.

2006/grothe/index.html

@@ -509,7 +509,7 @@ Kuhn’s and Ross J. Anderson’s.</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/grothe/Makefile">Makefile</a> - entry Makefile</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/grothe/grothe.orig.c">grothe.orig.c</a> - original source code</li>
 <li><a href="arabian.txt">arabian.txt</a> - sample input</li>
-<li><a href="olympics.txt">olympics.txt</a> - sample input</li>
+<li><a href="olympic.txt">olympic.txt</a> - sample input</li>
 <li><a href="test.txt">test.txt</a> - sample input</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/grothe/try.sh">try.sh</a> - script to try entry</li>
 <li><a href="twinkle.txt">twinkle.txt</a> - sample input</li>