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);
+}

lib/extensions/renderNotNull.dart

@@ -1,5 +1,3 @@
 extension RenderNotNullExt<T> on T? {
-  R? wrapNullable<R>(R Function(T data) defaultValueCallback) {
-    return this != null ? defaultValueCallback(this as T) : null;
-  }
-}
+  R? wrapNullable<R>(R Function(T data) defaultValueCallback) => this != null ? defaultValueCallback(this as T) : null;
+}

lib/extensions/text.dart

@@ -2,11 +2,11 @@ import 'package:flutter/material.dart';
 
 extension TextExt on Text {
   Size get size {
-    final TextPainter textPainter = TextPainter(
+    final textPainter = TextPainter(
         text: TextSpan(text: data, style: style),
         maxLines: 1,
         textDirection: TextDirection.ltr
     )..layout(minWidth: 0, maxWidth: double.infinity);
     return textPainter.size;
   }
-}
+}

lib/extensions/timeOfDay.dart

@@ -1,15 +1,9 @@
 import 'package:flutter/material.dart';
 
 extension TimeOfDayExt on TimeOfDay {
-  bool isBefore(TimeOfDay other) {
-    return hour < other.hour && minute < other.minute;
-  }
+  bool isBefore(TimeOfDay other) => hour < other.hour && minute < other.minute;
 
-  bool isAfter(TimeOfDay other) {
-    return hour > other.hour && minute > other.minute;
-  }
+  bool isAfter(TimeOfDay other) => hour > other.hour && minute > other.minute;
 
-  TimeOfDay add({int hours = 0, int minutes = 0}) {
-    return replacing(hour: hour + hours, minute: minute + minutes);
-  }
-}
+  TimeOfDay add({int hours = 0, int minutes = 0}) => replacing(hour: hour + hours, minute: minute + minutes);
+}