/** Quotes string correctly, eg. removes all quotes from the string and adds 

     * just one at the start and

     * second one at the end.

     * @param s string to be quoted

     * @return correctly quoted string

     */

    public static final String quoteString(String s) {

        if (s.indexOf(' ') > -1) {

            StringBuffer sb = new StringBuffer(s);

            int i = 0;

            while (i < sb.length()) {

                if (sb.charAt(i) == '\"') sb.deleteCharAt(i);

                else i++;

            }

            sb.insert(0, '\"');

            sb.append('\"');

            return sb.toString();

        }

        return s;

    }