removed unused code
removed unused code

violetag/demo,yona-projects/yona,oolso/yobi,ahb0327/yobi,doortts/fork-yobi,doortts/fork-yobi,yona-projects/yona,Limseunghwan/oss,ahb0327/yobi,brainagenet/yobi,ChangsungKim/TestRepository01,ChangsungKim/TestRepository01,bloodybear/yona,oolso/yobi,ahb0327/yobi,naver/yobi,Limseunghwan/oss,doortts/forked-for-history,bloodybear/yona,violetag/demo,bloodybear/yona,doortts/forked-for-history,brainagenet/yobi,ihoneymon/yobi,doortts/fork-yobi,doortts/fork-yobi,doortts/forked-for-history,ihoneymon/yobi,ihoneymon/yobi,naver/yobi,oolso/yobi,bloodybear/yona,Limseunghwan/oss,yona-projects/yona,brainagenet/yobi,yona-projects/yona,naver/yobi