rem: makeFileName(char *prefix, char *name)
add: makeFileName(char *prefix)
context: makeFileName(char *prefix, char *name){    char *fname, *str;    int i;    str = wstrappend(prefix, name);    fname = wstrdup(str);    i = 1;    while (access(fname, F_OK)==0) {	char buf[16];	free(fname);	sprintf(buf, "%i", i++);	fname = wstrappend(str, buf);    }    free(str);    return fname;}