Change

while (getline(cin, s)) {
    //...
}

to

while (getline(cin, s)) {
    if (s == "")
        continue;
    //...
}


Test case:

           goto                      Main

 END:
     end

   MAIN:
     print 1
      if 1 == 2 goto end
      print 2
     if  1  ==    2    goto    end

Edited by author 22.05.2016 14:25