Спираль самая

package yulalenk.exam.io;
import java.util.Scanner;

public class SpiralMatrix {

    private static void spiralFill(char[][] matrix, String inputString) {
        int[] directionsX = {0, 1, 0, -1};
        int[] directionsY = {1, 0, -1, 0};
        int rows = matrix.length;
        int cols = matrix[0].length;
        int totalElements = rows * cols;
        int row = 0, col = 0;
        int directionIndex = 0;
        int stringIndex = 0;

        while (stringIndex < inputString.length()) {
            if (row >= 0 && row < rows && col >= 0 && col < cols && matrix[row][col] == 0) {
                matrix[row][col] = inputString.charAt(stringIndex);
                stringIndex++;
            }

            int newRow = row + directionsX[directionIndex];
            int newCol = col + directionsY[directionIndex];

            if (newRow < 0 || newRow >= rows || newCol < 0 || newCol >= cols || matrix[newRow][newCol] != 0) {
                directionIndex = (directionIndex + 1) % 4;
            }

            row += directionsX[directionIndex];
            col += directionsY[directionIndex];
        }
    }

    private static char[][] spiralMatrix(String inputString, int rows, int cols) {
        char[][] matrix = new char[rows][cols];
        spiralFill(matrix, inputString.substring(0, Math.min(rows * cols, inputString.length())));
        return matrix;
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String[] numbers = scanner.nextLine().split(" ");
        int rows = Integer.parseInt(numbers[0]);
        int cols = Integer.parseInt(numbers[1]);

        String inputString = scanner.nextLine();

        char[][] matrix = spiralMatrix(inputString, rows, cols);

        StringBuilder stringBuilder = new StringBuilder();

        for (char[] row : matrix) {
            for (char cell : row) {
                stringBuilder.append(cell == 0 ? "" : cell);
            }
        }

        System.out.println(stringBuilder);
    }
}