private void prepareData(GitData gitData, List<Repository> repositories, User user)
      throws IOException {
    UserDetail userDetail = new UserDetail();
    userDetail.setName(user.getLogin());
    userDetail.setAvatarUrl(user.getAvatarUrl());
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd.MM.yyyy");
    userDetail.setCreatedAt(simpleDateFormat.format(user.getCreatedAt()));
    userDetail.setEmail(user.getEmail());
    userDetail.setFollower(user.getFollowers());
    userDetail.setDiskUsage(user.getDiskUsage());

    gitData.setUser(userDetail);

    Map<String, Integer> usedLanguages = new HashMap<>();
    for (Repository repository : repositories) {
      String language = (repository.getLanguage() == null) ? "Unknown" : repository.getLanguage();
      if (usedLanguages.containsKey(language)) {
        int count = usedLanguages.get(language);
        usedLanguages.replace(language, ++count);
      } else {
        usedLanguages.put(language, 1);
      }
    }

    gitData.setUsedLanguages(usedLanguages);
  }