/in/foo.c: In function 'Mul':
/in/foo.c:15:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(i=0; i<len1; i++)
  ^~~
/in/foo.c:18:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   len = len1 + len2;
   ^~~
/in/foo.c: In function 'main':
/in/foo.c:64:3: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
   else
   ^~~~
/in/foo.c:67:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
    printf("\n");
    ^~~~~~
/in/foo.c: In function 'Power':
/in/foo.c:44:9: warning: 'len' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return len;
         ^~~