removed dotenv and replaced with environment variables

lib/data/network/currencyApi.dart

@@ -1,6 +1,5 @@
 import 'package:dio/dio.dart';
 import 'package:easy_cc_flutter/data/network/app_dio.dart';
-import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:json_annotation/json_annotation.dart';
 import 'package:retrofit/retrofit.dart';
 
@@ -11,10 +10,11 @@ part 'currencyApi.g.dart';
 @RestApi(baseUrl: "https://free.currencyconverterapi.com/api/v3/")
 abstract class CurrencyApi {
   factory CurrencyApi(Dio dio) = _CurrencyApi;
+  static const api = String.fromEnvironment('currencyApiKey');
   
   static CurrencyApi create() {
     final dio = AppDio.createDio();
-    dio.options.queryParameters.addAll({"apiKey": dotenv.env['apiKey']!});
+    dio.options.queryParameters.addAll({"apiKey": api});
 
     return _CurrencyApi(dio);
   }

lib/main.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart';
-import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:logger/logger.dart';
 
 import 'Home.dart';
@@ -13,7 +12,6 @@ var logger = Logger(
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
   setupLocator();
-  await dotenv.load();
   await locator<PreferenceProvider>().init();
   runApp(const MyApp());
 }

pubspec.lock

@@ -209,13 +209,6 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
-  flutter_dotenv:
-    dependency: "direct main"
-    description:
-      name: flutter_dotenv
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "5.0.2"
   flutter_lints:
     dependency: "direct dev"
     description:

pubspec.yaml

@@ -46,7 +46,6 @@ dependencies:
   get_it: ^7.2.0
   retrofit: ^3.0.1+1
   logger: ^1.1.0
-  flutter_dotenv: ^5.0.2
   mockito: ^5.3.2
 
 dev_dependencies:

test/unit_test/repository_test.dart

@@ -8,7 +8,6 @@ import 'package:easy_cc_flutter/data/prefs/CurrencyPair.dart';
 import 'package:easy_cc_flutter/data/prefs/PreferenceProvider.dart';
 import 'package:easy_cc_flutter/data/repository/RepositoryImpl.dart';
 import 'package:easy_cc_flutter/locator.dart';
-import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:mockito/annotations.dart';
 import 'package:mockito/mockito.dart';
@@ -37,9 +36,8 @@ void main() {
   const String fromCurrency = "AUD - Australian Dollar";
   const String toCurrency = "GBP - British Pound Sterling";
 
-  setUpAll(() async {
-    // Setup
-    await dotenv.load(fileName: "test/resources/test_res.env");
+  setUpAll(() {
+    TestWidgetsFlutterBinding.ensureInitialized();
     // Create mock object.
     preferenceProvider = MockPreferenceProvider();
     currencyApi = MockCurrencyApi();

test/unit_test/viewmodel_test.dart

@@ -6,7 +6,6 @@ import 'package:easy_cc_flutter/data/model/Currency.dart';
 import 'package:easy_cc_flutter/data/prefs/CurrencyPair.dart';
 import 'package:easy_cc_flutter/data/repository/RepositoryImpl.dart';
 import 'package:easy_cc_flutter/locator.dart';
-import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:mockito/annotations.dart';
 import 'package:mockito/mockito.dart';
@@ -24,9 +23,9 @@ void main() {
   const String fromCurrency = "AUD - Australian Dollar";
   const String toCurrency = "GBP - British Pound Sterling";
 
-  setUpAll(() async {
-    // Setup
-    await dotenv.load(fileName: "test/resources/test_res.env");
+  setUpAll(() {
+    TestWidgetsFlutterBinding.ensureInitialized();
+
     // Create mock object.
     repository = MockRepositoryImpl();