Revert "delete all"

This reverts commit 8ee23264e803b657f7ab4418bead1a451e4192f4.
Merge branch 'master' of https://github.com/lxqlx/Hotel_Booking_System
Revert "Revert "delete all""

This reverts commit f837f29b9f332745294a72647ee482fb3f041f2b.