fix broken markdown local links in 2000/dhyang/README.md

Ran `bin/readme2index.sh -v 1 2000/dhyang` to perform the above.

2000/dhyang/README.md

@@ -44,7 +44,7 @@ For your enjoyment:
 3. Compile that file.
 4. Repeat steps 2 and 3 until eventually the output cycles.
 
-To interpret the output: the [dhyang.c](%%REPO_URL%%/2000/dhyang/dhyang.c.c) is an image of Saitou
+To interpret the output: the [dhyang.c](%%REPO_URL%%/2000/dhyang/dhyang.c) is an image of Saitou
 Hajime, which eventually generates three sources files that are images of "aku
 soku zan" (sin swift slay), Saitou's motto ;)
 

2000/dhyang/index.html

@@ -421,7 +421,7 @@ them with cool layout!</p>
 <li>Compile that file.</li>
 <li>Repeat steps 2 and 3 until eventually the output cycles.</li>
 </ol>
-<p>To interpret the output: the <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2000/dhyang/dhyang.c.c">dhyang.c</a> is an image of Saitou
+<p>To interpret the output: the <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2000/dhyang/dhyang.c">dhyang.c</a> is an image of Saitou
 Hajime, which eventually generates three sources files that are images of “aku
 soku zan” (sin swift slay), Saitou’s motto ;)</p>
 <p>For best viewing, set tab spaces to 8 characters, and set your