docs: private String getPasswordOnRecord(final String username) throws IOException {
          try (val stream = Files.lines(fileName.getFile().toPath())) {
              return stream.map(line -> line.split(this.separator))
                  .filter(lineFields -> {
                      val userOnRecord = lineFields[0];
                      return username.equals(userOnRecord);
                  })
                  .map(lineFields -> lineFields[1])
                  .findFirst()
                  .orElse(null);
          }
      }