Helper.java

//      Sokoban puzzles auto generator
//      https://dxdy.ru/post1541620.html#p1541620
//      2021 dec B@R5uk

public class Helper {

    public static void displayNumbers (int cellsNumber) {
        System .out .println ("\nBoxes         States");
        for (int k = 1; Integer .min (100, cellsNumber) > k; ++k) {
            long value = StateSpace .getStatesNumber (cellsNumber, k);
            System .out .println (String .format ("%5d %14s", k,
                    0 > value ? "Out of range" : spacedNumber (value)));
        }
    }

    public static String spacedNumber (long number) {
        int k, l, length;
        String numberString;
        StringBuilder result = new StringBuilder ();

        if (0 > number) {
            result .append ('-');
            number = -number;
        }
        numberString = Long .toString (number);
        length = numberString .length ();
        k = 0;
        l = length % 3;
        if (0 == l) {
            l = 3;
        }
        while (true) {
            result .append (numberString .substring (k, l));
            k = l;
            l += 3;
            if (length == k) {
                break;
            }
            result .append (' ');
        }
        return result .toString ();
    }
}