/in/foo.c: In function 'toInt':
/in/foo.c:57:6: error: called object 'base' is not a function or function pointer
   57 | ans+=base(str[i]-'0');
      |      ^~~~
/in/foo.c:55:7: note: declared here
   55 | int i,base=1,ans=0;
      |       ^~~~