private static void rotate(char[][] a) {
        int n = a.length;
        for (int i = 0; i < n / 2; i++) {
            for (int j = i; j < n - i - 1; j++) {
                char temp = a[i][j];
                a[i][j] = a[n - j - 1][i];
                a[n - j - 1][i] = a[n - i - 1][n - j - 1];
                a[n - i - 1][n - j - 1] = a[j][n - i - 1];
                a[j][n - i - 1] = temp;
            }
        }
    }
Why Did you create this class? what does it do?
src/adventofcode/FractalArt_21.java