add misc kanji utils

lib/router.dart

@@ -2,10 +2,10 @@ import 'dart:io';
 
 import 'package:tangocard_reader/models/data_entry.dart';
 import 'package:tangocard_reader/models/router_args.dart';
-import 'package:tangocard_reader/screens/practise/flashcard.dart';
 import 'package:tangocard_reader/screens/home.dart';
 import 'package:tangocard_reader/screens/pages/tango_list.dart';
 import 'package:flutter/material.dart';
+import 'package:tangocard_reader/screens/practise/practise.dart';
 
 import 'screens/pages/kanji_list.dart';
 
@@ -28,28 +28,28 @@ class PageRouter {
       case '/benkyou/tango':
         final benkyouArgs = args as BenkyouArgs;
         return MaterialPageRoute(
-          builder: (_) => FlashcardView(
-            cards: benkyouArgs.cards as List<YokutangoEntry>,
-            index: benkyouArgs.index,
+          builder: (_) => PractiseView(
+            entries: benkyouArgs.cards as List<YokutangoEntry>,
+            index: benkyouArgs.index ?? 0,
+            isKanji: false,
           ),
         );
 
       case '/benkyou/kanji':
-        // final benkyouArgs = args as BenkyouArgs;
-        // return MaterialPageRoute(
-        //   builder: (_) => FlashcardView(
-        //     cards: benkyouArgs.cards as List<YokutangoEntry>,
-        //     index: benkyouArgs.index,
-        //   ),
-        // );
+        final benkyouArgs = args as BenkyouArgs;
+        return MaterialPageRoute(
+          builder: (_) => PractiseView(
+            entries: benkyouArgs.cards as List<KanjiEntry>,
+            index: benkyouArgs.index ?? 0,
+            isKanji: true,
+          ),
+        );
 
       default:
         return MaterialPageRoute(
           builder: (_) => Scaffold(
             appBar: AppBar(title: const Text('Error')),
-            body:  Center(
-              child: ErrorWidget('No such route...')
-            ),
+            body: Center(child: ErrorWidget('No such route...')),
           ),
         );
     }