rem: char name[256], buff[256];
add: char name[256];
context: do_rmdir(int argc, char **argv){    int err;    char name[256], buff[256];    if (cur_fd >= 0)        do_close(0, NULL);    if (argc < 2) {        printf("rm: need a file name to remove\n");        return;    }    sprintf(name, "/myfs/%s", &argv[1][0]);        err = sys_rmdir(1, -1, name);    if (err != 0) {        printf("rmdir: error removing: %s: %s\n", name, strerror(err));        return;    }}