foo.c: In function 'main':
foo.c:72:11: warning: unknown conversion type character 'l' in format [-Wformat=]
 printf("%llu",sum);
           ^
foo.c:72:8: warning: too many arguments for format [-Wformat-extra-args]
 printf("%llu",sum);
        ^~~~~~
foo.c:72:11: warning: unknown conversion type character 'l' in format [-Wformat=]
 printf("%llu",sum);
           ^
foo.c:72:8: warning: too many arguments for format [-Wformat-extra-args]
 printf("%llu",sum);
        ^~~~~~