Robot v1.0 Darven project

#include <SoftwareSerial.h>
#include <Servo.h>

SoftwareSerial HC06(11,10);
Servo Scanner;
const char klaxon = 4;
const char motor_d = 2;
const char motor_g = 3;
const char LED_d = 7;
const char LED_g = 6;
String messageRecu;

void setup() {
  Serial.begin(9600);
  HC06.begin(9600);
  Scanner.attach(5);
  Scanner.write(90);
  pinMode(motor_d, OUTPUT);
  pinMode(motor_g, OUTPUT);
  pinMode(klaxon, OUTPUT);
  digitalWrite(motor_d, 1);
  digitalWrite(motor_g, 1);
}

void loop()
{
    while(HC06.available())
    {
      delay(3);
      char c = HC06.read();
      messageRecu += c;
    }
    if (messageRecu.length() >0)
    {
      Serial.println(messageRecu);
      if (messageRecu == "Scann")
        {Scanner.write(5);
         delay(1000);
         Scanner.write(90);
         delay(1000);
         Scanner.write(175);
         delay(1000);
         Scanner.write(90);}
      if (messageRecu == "tut-tut")
        {digitalWrite(klaxon, 1);
         delay(500);
         digitalWrite(klaxon, 0);
         delay(500);
         digitalWrite(klaxon, 1);
         delay(500);
         digitalWrite(klaxon, 0);}
      if (messageRecu == "avancer")
        {digitalWrite(motor_d, 0);
         digitalWrite(motor_g, 0);
         delay(1000);
         digitalWrite(motor_d, 1);
         digitalWrite(motor_g, 1);}
      if (messageRecu == "droite")
        {digitalWrite(motor_d, 1);
         digitalWrite(motor_g, 0);
         delay(100);
         digitalWrite(LED_g, 1);
         delay(100);
         digitalWrite(LED_g, 0);
         delay(100);
         digitalWrite(LED_g, 1);
         delay(100);
         digitalWrite(LED_g, 0);
         delay(100);
         digitalWrite(LED_g, 1);
         delay(100);
         digitalWrite(LED_g, 0);
         delay(100);
         digitalWrite(LED_g, 1);
         delay(100);
         digitalWrite(LED_g, 0);
         delay(100);
         digitalWrite(LED_g, 1);
         delay(100);
         digitalWrite(LED_g, 0);
         digitalWrite(motor_d, 1);
         digitalWrite(motor_g, 1);}
      if (messageRecu == "gauche")
        {digitalWrite(motor_d, 0);
         digitalWrite(motor_g, 1);
         delay(100);
         digitalWrite(LED_d, 1);
         delay(100);
         digitalWrite(LED_d, 0);
         delay(100);
         digitalWrite(LED_d, 1);
         delay(100);
         digitalWrite(LED_d, 0);
         delay(100);
         digitalWrite(LED_d, 1);
         delay(100);
         digitalWrite(LED_d, 0);
         delay(100);
         digitalWrite(LED_d, 1);
         delay(100);
         digitalWrite(LED_d, 0);
         delay(100);
         digitalWrite(LED_d, 1);
         delay(100);
         digitalWrite(LED_d, 0);
         digitalWrite(motor_d, 1);
         digitalWrite(motor_g, 1);}
      messageRecu="";
    }
}