[Bug] Clear button deletes entire input in math challenge instead of removing digits one-by-one (#648)

* Update alarm_ring_view.dart

added exit preview button

* Update alarm_challenge_controller.dart

math-bug

* Update maths_challenge_view.dart

* Update alarm_ring_view.dart

Author: mahendra-918

lib/app/modules/alarmChallenge/controllers/alarm_challenge_controller.dart

@@ -246,4 +246,13 @@ class AlarmChallengeController extends GetxController {
       AudioUtils.playAlarm(alarmRecord: alarmRecord);
     }
   }
+  void removeDigit() {
+  if (displayValue.value.isNotEmpty) {
+    displayValue.value = displayValue.value.substring(
+      0, 
+      displayValue.value.length - 1
+    );
+  }
 }
+}
+

lib/app/modules/alarmChallenge/views/maths_challenge_view.dart

@@ -181,7 +181,7 @@ class MathsChallengeView extends GetView<AlarmChallengeController> {
         () => ElevatedButton(
         onPressed: () {
           Utils.hapticFeedback();
-          controller.displayValue.value = '';
+          controller.removeDigit();
         },
         style: ElevatedButton.styleFrom(
           backgroundColor: themeController.primaryTextColor.value.withOpacity(0.45),
@@ -228,3 +228,4 @@ class MathsChallengeView extends GetView<AlarmChallengeController> {
     );
   }
 }
+