void square(struct Png *image, struct Png *image2, int width_pixel, int size) {
    int x1, x2, x3, x4, y1, y2, y3, y4;
    for (int y = 0; y < image->height; y++) {
        png_byte *row = image->row_pointers[y];
        for (int x = 0; x < image->width; x++) {
            png_byte *ptr = &(row[x * width_pixel]);
            if (ptr[0] == 255 && ptr[1] == 0 && ptr[2] == 0) {
                x1 = x - size / 2;
                y1 = y + size / 2;
                x2 = x + size / 2;
                y2 = y1;
                x3 = x2;
                y3 = y - size / 2;
                x4 = x1;
                y4 = y3;
                paint_line(image2, 3, x1, y1, x2, y2, 1, 255, 0, 0);
                paint_line(image2, 3, x2, y2, x3, y3, 1, 255, 0, 0);
                paint_line(image2, 3, x3, y3, x4, y4, 1, 255, 0, 0);
                paint_line(image2, 3, x1, y1, x4, y4, 1, 255, 0, 0);
            }
        }
    }

}