updated DisplayMyShelf()
Merge branch 'master' of https://github.com/bxguan8888/UI-group-project
Merge branch 'master' of https://github.com/bxguan8888/UI-group-project
Merge branch 'master' of https://github.com/bxguan8888/UI-group-project
Merge branch 'master' of https://github.com/bxguan8888/UI-group-project
Added comment for code
Merge branch 'master' of https://github.com/bxguan8888/UI-group-project
Change the DisplayMyShelf()
Merge branch 'master' of https://github.com/bxguan8888/UI-group-project