/in/foo.c: In function 'main':
/in/foo.c:24:12: warning: too many arguments for format [-Wformat-extra-args]
     printf("%d", x, n);
            ^~~~
/in/foo.c: In function 'Power':
/in/foo.c:65:16: warning: passing argument 2 of 'Mul' makes integer from pointer without a cast [-Wint-conversion]
         Mul(a, a, temp);
                ^
/in/foo.c:34:6: note: expected 'int' but argument is of type 'char *'
 void Mul(char *a, int b, char *result) {
      ^~~