/in/foo.cc: In function 'std::__cxx11::string dezero(std::__cxx11::string)':
/in/foo.cc:9:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<a.length();i++)
           ^
/in/foo.cc:13:6: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(i==a.length()) return "0";
      ^
/in/foo.cc:18:1: error: a function-definition is not allowed here before '{' token
 {
 ^
/in/foo.cc:100:1: error: expected '}' at end of input
 }
 ^