int red = 13;
int green = 12;
int blue = 11;

void setup() {
pinMode(red,OUTPUT);
pinMode(green,OUTPUT);
pinMode(blue,OUTPUT);
}

void loop() {
red()
delay(1000);
green()
delay(1000);
blue()
delay(1000);

void red () {
  digitalWrite(red,LOW);
  digitalWrite(blue,HIGH);
  digitalWrite(green,HIGH);
}
void green() {
  digitalWrite(red,HIGH);
  digitalWrite(blue,HIGH);
  digitalWrite(green,LOW);
}
void blue() {
  digitalWrite(red,HIGH);
  digitalWrite(blue,LOW);
  digitalWrite(green,HIGH);
}