TechGig Reverse T9

import java.util.HashMap;
import java.util.Map;

/**
 *
 * @author dhaval
 */
public class TechgigPuzzle {

    public static void main(String[] args) {
        System.out.println(new TechgigPuzzle11().reverse_t9("44204420442"));
        System.out.println(new TechgigPuzzle11().reverse_t9("2 22 2223 33 3334 44 4445 55 5556 66 666"));
        System.out.println(new TechgigPuzzle11().reverse_t9("2 2 2 2 2 2 2 2 2"));
    }

    String reverse_t9(String k) {
        Map m = new HashMap<>();
        m.put("01", ' ');
        m.put("75", 's');
        m.put("95", 'z');
        int i=1, j, l, c;
        c = 2;
        for (; i < 24;c++) {
            for (j = 1; j < 4;) {
                m.put(c + "" + j++, (char) (++i + 95));
            }
        }
        String s = "";
        l = k.length();
        c = 1;
        for (i = 0; i < l;) {
            char p = k.charAt(i);
            char n = l > ++i?k.charAt(i):0;
            if (p == n)c++;
            else if (c != 1 || p != ' ') {
                s += m.get(p + "" + c);
                c = 1;
            }
        }
        return s;
    }

}