Fixes a invalid length hash due to the way dart outputs hex

test/hash_test.dart

@@ -0,0 +1,8 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:libac_flutter/utils/Hashing.dart';
+
+void main() {
+  test("Test md5", () {
+    expect(Hashing.md5Hash("Hello World"), "b10a8db164e0754105b7a99be72e3fe5");
+  });
+}