message: String attribute zero terminate in C interface
diff: @@ -162,6 +162,7 @@ adios2_error adios2_attribute_data(void *data, size_t *size,
  char *dataT = reinterpret_cast<char *>(data);
  attributeCpp->m_DataSingleValue.copy(
  dataT, attributeCpp->m_DataSingleValue.size());
  + dataT[attributeCpp->m_DataSingleValue.size()] = '\0';
  *size = 1;
  }
  else
  