/in/l6.c: In function 'main':
/in/l6.c:23:11: error: variable 'fd' set but not used [-Werror=unused-but-set-variable]
     FILE *fd;
           ^~
/in/l6.c:7:10: error: unused variable 'str' [-Werror=unused-variable]
     char str[1000];
          ^~~
cc1: all warnings being treated as errors