ultrasonic sensor and line follower robot

I don't see that posting another post is impolite behavior!! and i think that nobody will mind ! Anyway, as I say I solved the problem by myself and I decide to share my new code for other people that may have my same problem

#include <NewPing.h>
// capteur ultrasonic
#define trigPin   24  //  Pin Trigger branchée sur la broche 12 de l'arduino
#define echoPin   25  //  Pin Echo branchée sur la broche 11 de l'arduino

NewPing sonar(trigPin, echoPin);
int maximumDistance = 50;  // distance Maximale acceptée (de 0-450 cm)
int minimumDistance = 0;   // distance Minimale acceptée (en cm)
int cm = 0; //declare une variable cm qui je l'utilise dans la comparaison 
boolean PasObstacle; 
const int distanceObstacle =10; //  Distance de détection d'un obstable : ici 10 cm
int distance = 0;
//Define Pins
int button1 = 22; //vert
int button = 23; //rouge
int z=0;
int w=0;

int ENA = 3; //Enable Pin of the Right Motor (must be PWM)
int IN1 = 7; //Control Pin
int IN2 = 2;

int ENB = 6; //Enable Pin of the Left Motor (must be PWM)
int IN3 = 4;
int IN4 = 5;

//Speed of the Motors
#define ENASpeed 250
#define ENBSpeed 250

int Sensor1 = 0;
int Sensor2 = 0;
int Sensor3 = 0;
int Sensor4 = 0;

void setup() {
Serial.begin(9600);
  pinMode(ENA, OUTPUT);
  pinMode(IN1, OUTPUT);
  pinMode(IN2, OUTPUT);

  pinMode(ENB, OUTPUT);
  pinMode(IN3, OUTPUT);
  pinMode(IN4, OUTPUT);

  pinMode(Sensor1, INPUT);
  pinMode(Sensor2, INPUT);
  pinMode(Sensor3, INPUT);
  pinMode(Sensor4, INPUT);

  pinMode(button, INPUT);
  pinMode(button1, INPUT);
}

void loop() {

  //Use analogWrite to run motor at adjusted speed
  analogWrite(ENA, ENASpeed);
  analogWrite(ENB, ENBSpeed);

  //Read the Sensor if HIGH (BLACK Line) or LOW (WHITE Line)
  Sensor1 = digitalRead(10);
  Sensor2 = digitalRead(11);
  Sensor3 = digitalRead(12);
  Sensor4 = digitalRead(13);
  z = digitalRead(22);
  w = digitalRead(23);
  //Set conditions for FORWARD, LEFT and RIGHT
distance =  mesureDistance();  // on lit la valeur en cm
if (PasObstacle)  {
  if (Sensor4 == HIGH && Sensor3 == LOW && Sensor2 == LOW && Sensor1 == LOW) 
  {
    //Turn LEFT
    //motor A Backward
    digitalWrite(IN1, HIGH);
    digitalWrite(IN2, LOW);

    //motor B Forward
    digitalWrite(IN3, LOW);
    digitalWrite(IN4, LOW);
  }

  else if (Sensor4 == LOW && Sensor3 == LOW && Sensor2 == LOW && Sensor1 == HIGH) 
    {
      //Turn RIGHT
    
    //motor A Forward
    digitalWrite(IN1, LOW);
    digitalWrite(IN2, LOW);

    //motor B Backward
    digitalWrite(IN3, HIGH);
    digitalWrite(IN4, LOW);
  }

  
  else if (Sensor4 == HIGH && Sensor3 == HIGH && Sensor2 == HIGH && Sensor1 == HIGH)
  {


  
       if  (w == 1)
  {
    //Turn RIGHT
    //motor A Forward
    digitalWrite(IN1, HIGH);
    digitalWrite(IN2, LOW);

    //motor B Backward
    digitalWrite(IN3, LOW);
    digitalWrite(IN4, LOW);
    delay(500);
  }
   else  if  (z == 1)
  {
    digitalWrite(IN1, HIGH);
    digitalWrite(IN2, LOW);
    digitalWrite(IN3, HIGH);
    digitalWrite(IN4, LOW);
    delay(500);
  }    
 else {
    // stop
    digitalWrite(IN1, LOW);
    digitalWrite(IN2, LOW);
    digitalWrite(IN3, LOW);
    digitalWrite(IN4, LOW);
 }  

  }
  else if (Sensor4 == LOW && Sensor3 == LOW && Sensor2 == LOW && Sensor1 == LOW)
  {
    // backward
    digitalWrite(IN1, LOW);
    digitalWrite(IN2, HIGH);
    digitalWrite(IN3, LOW);
    digitalWrite(IN4, HIGH);
  }


else 
  {
    //FORWARD
    digitalWrite(IN1, HIGH);
    digitalWrite(IN2, LOW);
    digitalWrite(IN3, HIGH);
    digitalWrite(IN4, LOW);
  }

 
}
else {
   digitalWrite(IN1, LOW);
    digitalWrite(IN2, LOW);
    digitalWrite(IN3, LOW);
    digitalWrite(IN4, LOW);
}
   
}
unsigned int mesureDistance() { // fonctin pour comparer la distance calculé avec la distanceobstacle
  int  cm = sonar.ping_cm();
  if (cm > distanceObstacle || cm  <= minimumDistance) {
    PasObstacle =  true;  // on renvoie true s'il n'y pas d'obstacle
  }
  else  {
    PasObstacle = false;  // on renvoie false s'il y a un obstacle
  }
 
  return cm; // retourne la distance du capteur en cm

}