pyramid.c

#define STARS "****************************************************"

void print_pyramid(int levels_n) {
    int max_w = levels_n + levels_n - 1;

    for (int level = 1; level <= levels_n; ++level) {
        int stars_n = level + level - 1;
        int pad = (max_w - stars_n) / 2;

        printf("%*s%.*s%*s\n", pad, "", stars_n, STARS, pad, "");
    }
}