Change package name

android/app/src/main/AndroidManifest.xml

 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.mdd.flutter_mdd_simulator">
+
     <application
+        android:icon="@mipmap/ic_launcher"
         android:label="flutter_mdd_simulator"
-        android:icon="@mipmap/ic_launcher">
+        android:preserveLegacyExternalStorage="true"
+        android:requestLegacyExternalStorage="true">
         <activity
             android:name=".MainActivity"
-            android:launchMode="singleTop"
-            android:theme="@style/LaunchTheme"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
             android:hardwareAccelerated="true"
+            android:launchMode="singleTop"
+            android:theme="@style/LaunchTheme"
             android:windowSoftInputMode="adjustResize">
             <!-- Specifies an Android theme to apply to this Activity as soon as
                  the Android process has started. This theme is visible to the user
@@ -16,8 +19,7 @@
                  to determine the Window background behind the Flutter UI. -->
             <meta-data
                 android:name="io.flutter.embedding.android.NormalTheme"
-              android:resource="@style/NormalTheme"
-              />
+                android:resource="@style/NormalTheme" />
             <!-- Displays an Android View that continues showing the launch screen
                  Drawable until Flutter paints its first frame, then this splash
                  screen fades out. A splash screen is useful to avoid any visual
@@ -25,11 +27,10 @@
                  Flutter's first frame. -->
             <meta-data
                 android:name="io.flutter.embedding.android.SplashScreenDrawable"
-              android:resource="@drawable/launch_background"
-              />
+                android:resource="@drawable/launch_background" />
             <intent-filter>
-                <action android:name="android.intent.action.MAIN"/>
-                <category android:name="android.intent.category.LAUNCHER"/>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
         <!-- Don't delete the meta-data below.

lib/main.dart

 import 'package:flutter/material.dart';
 import 'package:flutter_mdd_simulator/screen/TapCard.dart';
 import 'package:intl/intl.dart';
-import 'package:unik_lib_flutter/unik_lib_flutter.dart';
+import 'package:prepaid_lib_flutter/unik_lib_flutter.dart';
 
 import 'PreferencesHelper.dart';