correct implementation of toAlarm

lib/model/requests/create_alarm_request.dart

@@ -1,7 +1,9 @@
-import '../alarm/alarm.dart' show AlarmType;
+import '../alarm/alarm.dart' show AlarmType, Alarm;
 
-class CreateAlarmRequest {
+abstract class CreateAlarmRequest {
   const CreateAlarmRequest({required this.alarmType});
 
   final AlarmType alarmType;
+
+  Alarm toAlarm(String id);
 }

lib/model/requests/create_fixed_time_alarm_request.dart

@@ -12,6 +12,7 @@ class CreateFixedTimeAlarmRequest extends CreateAlarmRequest {
     : triggerAt = alarm.triggerAt,
       super(alarmType: AlarmType.timeFixed);
 
-  FixedTimeAlarm toFixedTimeAlarm(String id) =>
+  @override
+  FixedTimeAlarm toAlarm(String id) =>
       FixedTimeAlarm(id: id, triggerAt: triggerAt!);
 }

lib/model/requests/create_location_alarm_request.dart

@@ -16,6 +16,7 @@ class CreateLocationAlarmRequest extends CreateAlarmRequest {
       radiusMeters = alarm.radiusMeters,
       super(alarmType: AlarmType.location);
 
-  LocationAlarm toLocationAlarm(String id) =>
+  @override
+  LocationAlarm toAlarm(String id) =>
       LocationAlarm(id: id, location: location!, radiusMeters: radiusMeters!);
 }

lib/model/requests/create_relative_time_alarm_request.dart

@@ -12,6 +12,7 @@ class CreateRelativeTimeAlarmRequest extends CreateAlarmRequest {
     : triggerAt = alarm.triggerAt,
       super(alarmType: AlarmType.timeRelative);
 
-  RelativeTimeAlarm toRelativeTimeAlarm(String id) =>
+  @override
+  RelativeTimeAlarm toAlarm(String id) =>
       RelativeTimeAlarm(id: id, triggerAt: triggerAt!);
 }