char buf[] = "test\ntest1";
        char buf1[] = "test\n#test1";
        char buf2[] = "test\ntest1\ntest2";

        struct sbuf *b = sbuf_new_auto();
        merge_3way(buf, buf1, buf2, b);

        sbuf_finish(b);
        printf("Vanilla:\n---\n%s\n---\n", buf);
        printf("Modified:\n---\n%s\n---\n", buf1);
        printf("New:\n---\n%s\n---\n", buf2);
        printf("Result:\n---\n%s\n---\n", sbuf_data(b));