public static String qMarkOut(String str) {
    String result = "";
    boolean inQuestion = false;
    boolean chopable = true;

    for (int i = 0; i < str.length(); i++)
        if (str.charAt(i) == '?') {
            if (!inQuestion && chopable && result.length() > 0) {
                result = result.substring(0, result.length() - 1);
                chopable = false;
            }
            inQuestion = true;
        }
        else {
            if (!inQuestion) {
                result += str.charAt(i);
                chopable = true;
            }
            inQuestion = false;
        }

    return result;
}