Initial commit

lib/features/calculator/presentation/mixin/calculator_mixin.dart

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+import 'package:flutter/cupertino.dart';
+
+mixin CalculatorMixin{
+  late TextEditingController weightController;
+  late TextEditingController sizeController;
+  late TextEditingController averageWeightController;
+  late TextEditingController productNameController;
+
+  void initControllers(){
+    weightController=TextEditingController();
+    sizeController=TextEditingController();
+    averageWeightController=TextEditingController();
+    productNameController=TextEditingController();
+  }
+
+  void disposeController(){
+    weightController.dispose();
+    sizeController.dispose();
+    averageWeightController.dispose();
+    productNameController.dispose();
+  }
+}