midi code update

#include <MIDI.h>
#include <Adafruit_NeoPixel.h>

// Define the MIDI channel and note number
const uint8_t midiChannel = 1;
const uint8_t midiNote = 69;

// Define the NeoPixel strip
const uint8_t numberOfPixels = 24;
const uint8_t pin = 12;

//creation de l'objet de la bande de led
Adafruit_NeoPixel strip = Adafruit_NeoPixel(numberOfPixels, pin, NEO_GRB + NEO_KHZ800);

// Initialize the MIDI library
MIDI_CREATE_INSTANCE(HardwareSerial, Serial, MIDI);

// This function will be called whenever a MIDI message is received
void onMIDIMessage(byte channel, byte command, byte data1, byte data2) {

  // Only process messages on the specified channel
  if (channel == midiChannel) {
    // If the message is a note on message...
    if (command == NOTE_ON) {
      // ...then set the brightness of the NeoPixels to the velocity of the note
      uint8_t green = (data1 * 255) / 127;
      for (uint8_t i = 0; i < numberOfPixels; i++) {
        strip.setPixelColor(i, green, 0, 0);
      }
    }
    else if (command == NOTE_OFF) {
      // If the message is a note off message...
        stip.clear();
    }
    // Update the NeoPixels
    strip.show();
    }
}

void setup() {
  // Initialize the serial port
  Serial.begin(9600);

  // Initialize the MIDI library
  MIDI.begin(MIDI_CHANNEL_OMNI);

  // Attach the onMIDIMessage function to the MIDI library
  MIDI.setHandleNoteOn(onMIDIMessage);
  MIDI.setHandleNoteOff(onMIDIMessage);

  strip.begin();
  strip.show();
}

void loop() {
// Do nothing
}