feat:#5 added free rooms api endpoint

backend/service/db/dbRooms.go

@@ -47,9 +47,7 @@ func clearAndSeparateRooms(events []struct {
 		// sport rooms don't have to be separated
 		if event.Course != "Sport" {
 			//split rooms by comma, tab, newline, carriage return, semicolon, space and non-breaking space
-			room = strings.FieldsFunc(event.Rooms, functions.IsSeparator(
-				[]rune{',', '\t', '\n', '\r', ';', ' ', '\u00A0'}),
-			)
+			room = functions.SeperateRoomString(event.Rooms)
 		} else {
 			room = append(room, event.Rooms)
 		}