changed totalTime to be a getter for preptime + cooktime

lib/models/recipe.dart

@@ -2,20 +2,6 @@ import '../src/enums.dart' show Difficulty, Cuisine, MealCategory;
 import 'ingredient_list_entry.dart';
 
 class Recipe {
-  final int id;
-  final String title;
-  final String description;
-  final Difficulty difficulty;
-  final List<IngredientListEntry> ingredients;
-  final List<String> steps;
-  final DateTime datePublished;
-  final Duration prepTime;
-  final Duration cookTime;
-  final Duration totalTime;
-  final List<String> keywords;
-  final MealCategory? mealCategory;
-  final Cuisine? cuisine;
-
   Recipe({
     this.id = -1,
     this.title = '',
@@ -24,7 +10,6 @@ class Recipe {
     required this.datePublished,
     this.prepTime = const Duration(),
     this.cookTime = const Duration(),
-    this.totalTime = const Duration(),
     this.mealCategory,
     this.cuisine,
     this.ingredients = const [],
@@ -32,6 +17,21 @@ class Recipe {
     this.steps = const [],
   });
 
+  final Duration cookTime;
+  final Cuisine? cuisine;
+  final DateTime datePublished;
+  final String description;
+  final Difficulty difficulty;
+  final int id;
+  final List<IngredientListEntry> ingredients;
+  final List<String> keywords;
+  final MealCategory? mealCategory;
+  final Duration prepTime;
+  final List<String> steps;
+  final String title;
+
+  Duration get totalTime => cookTime + prepTime;
+
   Recipe copyWith({
     int? id,
     String? title,
@@ -61,7 +61,6 @@ class Recipe {
       datePublished: datePublished ?? this.datePublished,
       prepTime: prepTime ?? this.prepTime,
       cookTime: cookTime ?? this.cookTime,
-      totalTime: totalTime ?? this.totalTime,
       keywords: keywords != null
           ? List<String>.from(keywords)
           : List<String>.from(this.keywords),