Several changes

lib/widgets/kanjimaji.dart

@@ -0,0 +1,18 @@
+import 'package:flutter/material.dart';
+
+extension _Hexcode on Color {
+  String get hexcode => '#${value.toRadixString(16).padLeft(8, '0')}';
+}
+
+class Kanimaji extends StatelessWidget {
+  final String kanji;
+  const Kanimaji({
+    Key? key,
+    required this.kanji,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Container();
+  }
+}