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Hi, i've made the checker, you can try it at http://project-gc.com/Challenges/GC5PPY5/12941
you can add the following code to listing page:
<a href="http://project-gc.com/Challenges/GC5PPY5/12941"><img src="http://maxcdn.project-gc.com/Images/Checker/12941" title="Project-GC Challenge checker" alt="PGC Checker"></a>