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errno_t retValue;
char *cstr;  /* pointer to null-terminated byte string */
string_mx *str1 = NULL;

retValue = strcreate_m(&str1, "hello, world", 0, NULL);
if (retValue != 0) {
  fprintf(stderr, "Error %d from strcreate_m.\n", retValue);
}
else { /* retrieve null-terminated byte string and print, print, and free string */
  retValue = getstr_m(&cstr, str1);
  if (retValue != 0) {
    fprintf(stderr, "error %d from getstr_m.\n", retValue);
  }
  printf("(%s)\n", cstr);
  free(cstr); /* free null-terminated byte string */
  cstr = NULL;
}