byte ledPin[] = {13, 12, 14, 27, 26, 25, 33, 32, 23, 22};
int ledDelay = 100 ;
int address = 1;
int currentPos = 5; 
unsigned long changeTime;
 
void setup() {
  for(int i=0; i<10 ; i++){ 
    pinMode(ledPin[i], OUTPUT);
  }
  changeTime = millis();
}

void loop() { 
  if ((millis() - changeTime) > ledDelay){
    ledChange();
    changeTime = millis();
  }
}

void ledChange() {
  for(int i=0; i<10 ; i++){
    digitalWrite(ledPin[i], LOW);
  }
  digitalWrite(ledPin[currentPos], HIGH);
  currentPos += address;
  if (currentPos == 9) {
    address = -1;
  }
  if (currentPos == 0) {
    address = 1;
  }
}