simplify string concenate
simplify string concenate

mafrosis/storm2,hw20686832/storm,mafrosis/storm2,scalp42/storm,neverware/storm,scalp42/storm,f/storm,emre/storm,scalp42/storm,hw20686832/storm,emre/storm,emre/storm,mafrosis/storm2,mafrosis/storm2,f/storm,f/storm,neverware/storm,emre/storm,hw20686832/storm,scalp42/storm,neverware/storm,hw20686832/storm