void split(const string& src, const string& separator, vector<string>& dest)

{

    string str = src;

    string substring;

    string::size_type start = , index;

    do

    {

        index = str.find_first_of(separator,start);

        if (index != string::npos)

        {

            substring = str.substr(start,index-start);

            dest.push_back(substring);

            start = str.find_first_not_of(separator,index);

            if (start == string::npos) return;

        }

    }while(index != string::npos);

    //the last token

    substring = str.substr(start);

    dest.push_back(substring);

}