Gist gist = gistJsonAdapter.fromJson(response.body().source());

          for (Map.Entry<String, GistFile> entry : gist.files.entrySet()) {
            System.out.println(entry.getKey());
            System.out.println(entry.getValue().content);
          }
        }
      }

      static class Gist {
        Map<String, GistFile> files;