@Override
    public String importTowns(String townsFileContent) {
        StringBuilder output = new StringBuilder();
        TownJsonImportDto[] dto = this.gson.fromJson(townsFileContent, TownJsonImportDto[].class);

        for (TownJsonImportDto townJsonImportDto : dto) {
            if (!this.validationUtil.isValid(townJsonImportDto)) {
                output.append(Constants.INCORRECT_DATA_MESSAGE).append(System.lineSeparator());
            }
            if (this.townRepository.findByName(townJsonImportDto.getName()) != null) {
                output.append(Constants.DUPLICATE_DATA_MESSAGE).append(System.lineSeparator());
            }
            Town town = this.modelMapper.map(townJsonImportDto, Town.class);
            this.townRepository.saveAndFlush(town);
            output.append(String.format(Constants.SUCCESSFUL_IMPORT_MESSAGE, "Town", town.getName()))
                    .append(System.lineSeparator());
        }
        return output.toString().trim();
    }