char *getenv(const char *name); int printf(char *fmt, ...); char *f3(char *t) { return t; } char *f2(char *u) { return f3(u); } char *f1(char *v) { return f2(v); } int main(void) { char *s, *unclean; unclean = getenv("PATH"); s = f1(unclean); printf(s); }