const int led_avant_g = D0;
const int led_avant_d = D1; 
const int led_arriere_g = D9; 
const int led_arriere_d = D10; 

void setup() {
  // initialize digital pin led as an output
  pinMode(led_avant_g, OUTPUT);
  pinMode(led_avant_d, OUTPUT);
  pinMode(led_arriere_g, OUTPUT);
  pinMode(led_arriere_d, OUTPUT);
}

void allumer_led_avant_g(){
  digitalWrite(led_avant_g, HIGH);   // turn the LED on  
}

void allumer_led_avant_d(){
  digitalWrite(led_avant_d, HIGH);   // turn the LED on  
}

void allumer_leds_avant(){
  allumer_led_avant_g();
  allumer_led_avant_d();
}

void eteindre_led_avant_g(){
  digitalWrite(led_avant_g, LOW);   // turn the LED on  
}

void eteindre_led_avant_d(){
  digitalWrite(led_avant_d, LOW);   // turn the LED on  
}

void eteindre_leds_avant(){
  eteindre_led_avant_g();
  eteindre_led_avant_d();
}

void allumer_led_arriere_g(){
  digitalWrite(led_arriere_g, HIGH);   // turn the LED on  
}

void allumer_led_arriere_d(){
  digitalWrite(led_arriere_d, HIGH);   // turn the LED on  
}

void allumer_leds_arriere(){
  allumer_led_arriere_g();
  allumer_led_arriere_d();
}

void eteindre_led_arriere_g(){
  digitalWrite(led_arriere_g, LOW);   // turn the LED on  
}

void eteindre_led_arriere_d(){
  digitalWrite(led_arriere_d, LOW);   // turn the LED on  
}

void eteindre_leds_arriere(){
  eteindre_led_arriere_g();
  eteindre_led_arriere_d();
}

void loop() {
  allumer_leds_avant();
  allumer_leds_arriere();
  delay(1000);
  eteindre_leds_avant();
  eteindre_leds_arriere();
  delay(1000);
}