func.c

/**
 * Given the file descriptor this function,
 * writes A, waits 2 second, writes "c,"
 */
void child_one_func(int fd){

  write(fd, "A - 1", 5);
  sleep(2);
  write(fd, "C - 3", 5);
  close(fd);
}

/**
 * Given the file descriptor this function,
 * Waits 1 second, writes "B", Waits 2 seconds,
 * then writes "D"
 */
void child_two_func(int fd){

  sleep(1);
  write(fd, "B - 2", 5);
  sleep(2);
  write(fd, "D - 4", 5);
  close(fd);
}