fix: type mismatch

internal/api/shelves.go

@@ -107,7 +107,7 @@ func (s *APIServer) createShelf(w http.ResponseWriter, r *http.Request) error {
 		Name:        data.Name,
 		RoomNumber:  data.RoomNumber,
 		Description: data.Description,
-		BuildingID:  data.BuildingID,
+		BuildingID:  *data.BuildingID,
 	}
 
 	err := s.db.CreateShelfLocation(shelf)
@@ -158,7 +158,7 @@ func (s *APIServer) updateShelf(w http.ResponseWriter, r *http.Request) error {
 	shelf := &types.ShelfLocation{
 		ID:         eShelf.ID,
 		Name:       data.Name,
-		BuildingID: data.BuildingID,
+		BuildingID: *data.BuildingID,
 		RoomNumber: data.RoomNumber,
 	}