first commit

untitled/tes.dart

@@ -0,0 +1,14 @@
+import 'dart:convert' as convert;
+
+void main() async {
+
+  var content = convert.utf8.encode("886");
+  var digest = convert.base64Encode(content);
+  print(digest);
+
+  List<int> bytes = convert.base64Decode(digest);
+  String result = convert.utf8.decode(bytes);
+
+  print(result);
+
+}