Brick Wall

#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>

typedef struct {
    int width;
    int height;
    bool *bricks;
} wall_t;

void build_wall(wall_t *wall);
void print_wall(wall_t *wall);

int main() {
    wall_t wall;
    if (scanf("%d %d", &wall.width, &wall.height) != 2) {
        fprintf(stderr, "Error: Wrong input!");
        return 100;
    }

    build_wall(&wall);
    print_wall(&wall);

    free(wall.bricks);
    return 0;
}

void build_wall(wall_t *wall) {
    int pixels = wall->width * wall->height;
    wall->bricks = malloc(pixels * sizeof(bool));

    int w = wall->width;
    for (int r = 0; r < wall->height; r++) {
        for (int c = 0; c < w; c++) {
            if (r%3 == 0 || r%3 == 1) {
                if (r%6 == 0 || r%6 == 1) {
                    if (c%5 == 4) {
                        wall->bricks[r*w + c] = false;
                    }
                    else {
                        wall->bricks[r*w + c] = true;
                    }
                }
                else if (r%6 == 3 || r%6 == 4) {
                    if (c%5 == 2) {
                        wall->bricks[r*w + c] = false;
                    }
                    else {
                        wall->bricks[r*w + c] = true;
                    }
                }
            }
            else if (r%3 == 2) {
                wall->bricks[r*w + c] = false;
            }
        }
    }
}

void print_wall(wall_t *wall) {
    int brick = wall->width * wall->height;
    int w = wall->width;

    for (int b = 0; b < brick; b++) {
        if (wall->bricks[b] == true) printf("##");
        else printf("  ");

        if (b%w == w-1) printf("\n");
    }
}