docs: def populate_headers(headers):
      """
      Concatenate headers with subheaders
      """
      result = [''] * len(headers[0])
      values = [''] * len(headers)
      for k_index in range(0, len(headers)):
          for i_index in range(0, len(headers[k_index])):
              if headers[k_index][i_index]:
                  values[k_index] = normalizer(
                      str(headers[k_index][i_index]))  # pass to str
  
              if len(exclude_empty_values(result)) > i_index:
                  result[i_index] += "-{}".format(values[k_index])
              else:
                  result[i_index] += str(values[k_index])
  
      return result