std::string stripnonalp(std::string input_string)
{
    std::string output_string = "";
    bool lastwasspace = false;
    for (char current_letter : input_string)
    {
        std::cout << "processing letter " << cu
        current_letter = tolower(current_letter);

        if (lastwasspace == false)
        {
            if((current_letter==32) || (current_letter==13) || (current_letter==10))
            {
                lastwasspace = true;
                output_string += " ";
            }
            if(current_letter==44)
            {
                output_string+= "'";
                lastwasspace = false;
            }
            if((current_letter>='a') && (current_letter<='z'))
            {
                output_string += current_letter;
                lastwasspace=false;
            }

        }
        else
        {
            if(current_letter==44)
            {
                output_string+= "'";
                lastwasspace = false;
            }
            if((current_letter>='a') && (current_letter<='z'))
            {
                output_string += current_letter;
                lastwasspace = false;
            }

        }
    }
    return output_string;
}