updated project style guidelines

lib/extensions/dateTime.dart

@@ -1,30 +1,20 @@
 import 'package:flutter/material.dart';
 
 extension IsSameDay on DateTime {
-  bool isSameDay(DateTime other) {
-    return year == other.year && month == other.month && day == other.day;
-  }
+  bool isSameDay(DateTime other) => year == other.year && month == other.month && day == other.day;
 
-  DateTime nextWeekday(int day) {
-    return add(Duration(days: (day - weekday) % DateTime.daysPerWeek));
-  }
+  DateTime nextWeekday(int day) => add(Duration(days: (day - weekday) % DateTime.daysPerWeek));
 
-  DateTime withTime(TimeOfDay time) {
-    return copyWith(hour: time.hour, minute: time.minute);
-  }
+  DateTime withTime(TimeOfDay time) => copyWith(hour: time.hour, minute: time.minute);
 
-  TimeOfDay toTimeOfDay() {
-    return TimeOfDay(hour: hour, minute: minute);
-  }
+  TimeOfDay toTimeOfDay() => TimeOfDay(hour: hour, minute: minute);
 
   bool isSameDateTime(DateTime other) {
-    bool isSameDay = this.isSameDay(other);
-    bool isSameTimeOfDay = (toTimeOfDay() == other.toTimeOfDay());
+    var isSameDay = this.isSameDay(other);
+    var isSameTimeOfDay = (toTimeOfDay() == other.toTimeOfDay());
 
     return isSameDay && isSameTimeOfDay;
   }
 
-  bool isSameOrAfter(DateTime other) {
-    return isSameDateTime(other) || isAfter(other);
-  }
-}
+  bool isSameOrAfter(DateTime other) => isSameDateTime(other) || isAfter(other);
+}