722. Remove Comments

class Solution {
public:
    vector<string> removeComments(vector<string>& source) {
        vector<string> res;
        string ln;
        int state = ;
        for (const auto & line : source) {
            for (int i = , ll = line.length(); i < ll; i++) {
                if (state == ) {
                    if (i < ll-) {
                        if (line[i] == '/' && line[i+] == '/')
                            break;  // // comment, skip line
                        else if (line[i] == '/' && line[i+] == '*') {
                            state = ;
                            i += ;
                            continue;
                        }
                    }
                    ln.push_back(line[i]);
                }
                else if (state == ) {  // inside /*
                    if (i < ll- && line[i] == '*' && line[i+] == '/') {
                        state = ;
                        i += ;
                        continue;
                    }
                }
            }
            if (state ==  && ln.length() > ) {
                res.push_back(ln);
                ln = "";
            }
        }
        if (ln.length() > )
            res.push_back(ln);
        return res;
    }
};