Display 7 segmentos (conteo 0 - 9) [MEJORA DEL CODIGO]

int led2 = 6;
int led3 = 7;
int led4 = 8;
int led5 = 9;
int led9 = 12;
int led7 = 10;
int led8 = 11;

void setup () {
  pinMode (led2, OUTPUT);
  pinMode (led3, OUTPUT);
  pinMode (led4, OUTPUT);
  pinMode (led5, OUTPUT);
  pinMode (led7, OUTPUT);
  pinMode (led8, OUTPUT);
  pinMode (led9, OUTPUT);

  }

void loop () {

    //numero 0
  digitalWrite (led8, HIGH);
  digitalWrite (led7, HIGH);
  digitalWrite (led3, HIGH);
  digitalWrite (led2, HIGH);
  digitalWrite (led4, HIGH);
  digitalWrite (led9, HIGH);
  delay(1000);
  digitalWrite (led8, LOW);
  digitalWrite (led7, LOW);
  digitalWrite (led3, LOW);
  digitalWrite (led2, LOW);
  digitalWrite (led4, LOW);
  digitalWrite (led9, LOW);
  // numero 1
  digitalWrite (led3, HIGH);
  digitalWrite (led7, HIGH);
  delay(1000);
  digitalWrite (led3, LOW);
  digitalWrite (led7, LOW);

  //numero 2
  digitalWrite (led8, HIGH);
  digitalWrite (led9, HIGH);
  digitalWrite (led5, HIGH);
  digitalWrite (led3, HIGH);
  digitalWrite (led2, HIGH);
  delay(1000);
  digitalWrite (led8, LOW);
  digitalWrite (led9, LOW);
  digitalWrite (led5, LOW);
  digitalWrite (led3, LOW);
  digitalWrite (led2, LOW);

  //numero 3
  digitalWrite (led8, HIGH);
  digitalWrite (led7, HIGH);
  digitalWrite (led5, HIGH);
  digitalWrite (led3, HIGH);
  digitalWrite (led2, HIGH);
  delay(1000);
  digitalWrite (led8, LOW);
  digitalWrite (led7, LOW);
  digitalWrite (led5, LOW);
  digitalWrite (led3, LOW);
  digitalWrite (led2, LOW);

  //numero 4
  digitalWrite (led4, HIGH);
  digitalWrite (led5, HIGH);
  digitalWrite (led3, HIGH);
  digitalWrite (led7, HIGH);
  delay(1000);
  digitalWrite (led4, LOW);
  digitalWrite (led3, LOW);
  digitalWrite (led5, LOW);
  digitalWrite (led7, LOW);

  //numero 5
  digitalWrite (led4, HIGH);
  digitalWrite (led7, HIGH);
  digitalWrite (led8, HIGH);
  digitalWrite (led2, HIGH);
  digitalWrite (led5, HIGH);
  delay(1000);
  digitalWrite (led4, LOW);
  digitalWrite (led7, LOW);
  digitalWrite (led5, LOW);
  digitalWrite (led8, LOW);
  digitalWrite (led2, LOW);

  //numero 6
  digitalWrite (led2, HIGH);
  digitalWrite (led4, HIGH);
  digitalWrite (led5, HIGH);
  digitalWrite (led7, HIGH);
  digitalWrite (led8, HIGH);
  digitalWrite (led9, HIGH);
  delay(1000);
  digitalWrite (led2, LOW);
  digitalWrite (led4, LOW);
  digitalWrite (led7, LOW);
  digitalWrite (led5, LOW);
  digitalWrite (led8, LOW);
  digitalWrite (led9, LOW);

  //numero  7
  digitalWrite (led2, HIGH);
  digitalWrite (led3, HIGH);
  digitalWrite (led7, HIGH);
  delay(1000);
  digitalWrite (led2, LOW);
  digitalWrite (led3, LOW);
  digitalWrite (led7, LOW);

  //numero 8
  digitalWrite (led2, HIGH);
  digitalWrite (led3, HIGH);
  digitalWrite (led4, HIGH);
  digitalWrite (led5, HIGH);
  digitalWrite (led7, HIGH);
  digitalWrite (led8, HIGH);
  digitalWrite (led9, HIGH);
  delay(1000);
  digitalWrite (led2, LOW);
  digitalWrite (led4, LOW);
  digitalWrite (led7, LOW);
  digitalWrite (led5, LOW);
  digitalWrite (led8, LOW);
  digitalWrite (led9, LOW);
  digitalWrite (led3, LOW);

  //numero 9
  digitalWrite (led3, HIGH);
  digitalWrite (led7, HIGH);
  digitalWrite (led2, HIGH);
  digitalWrite (led4, HIGH);
  digitalWrite (led5, HIGH);
  delay(1000);
  digitalWrite (led3, LOW);
  digitalWrite (led7, LOW);
  digitalWrite (led2, LOW);
  digitalWrite (led4, LOW);
  digitalWrite (led5, LOW);

  //numero 0
  digitalWrite (led8, HIGH);
  digitalWrite (led7, HIGH);
  digitalWrite (led3, HIGH);
  digitalWrite (led2, HIGH);
  digitalWrite (led4, HIGH);
  digitalWrite (led9, HIGH);
  delay(1000);
  digitalWrite (led8, LOW);
  digitalWrite (led7, LOW);
  digitalWrite (led3, LOW);
  digitalWrite (led2, LOW);
  digitalWrite (led4, LOW);
  digitalWrite (led9, LOW);


  }