__argz_extract (char *argz, size_t len, char **argv)
__argz_extract (const char *argz, size_t len, char **argv)
__argz_extract (char *argz, size_t len, char **argv){  while (len > 0)    {      size_t part_len = strlen (argz);      *argv++ = argz;      argz += part_len + 1;      len -= part_len + 1;    }  *argv = 0;}