sd and clock and radio working in LOOP

working_loop.ino

  bool write_to_sd = false;
  if (radio.receiveDone())
  {
    Serial.println(radio.SENDERID);
    if (radio.SENDERID == 2) {
      write_to_sd = true;
    }
    rtc.update();
    printTime();
    if (radio.ACKRequested()) {
    }
  }
  if (write_to_sd) {
    if (file.open("callback.txt", O_CREAT | O_WRITE)) {
      file.println("time");
      file.close();
      Serial.println("sd card yes");
    } else {
      Serial.println("SD Card Fail");
    }
  }