- therefor if the program gets extended, its unlikly that
  someone will forget to call free()
- also this gets rid of copy-paste free() calls (which look stupid)

- implicitly declaring library function is bad manner :)

- adding missing free() calls
- dont malloc ourselves as getline() also does a malloc
  (and anyway called realloc before if the size_t was
   smaller then the actual len(input-line) to behaviour
   is the same!)