Line tracker code

#define IRR 7 //IR right
#define IRL 8 //IR left
#define USECHO A0 //ultrasonic echo
#define USTRIG A1 //ultrasonic trig
#define MRF 6 //motor right front
#define MRB 9 //motor right back
#define MLF 10 //motor left front
#define MLB 11 //motor left back
#define FAST 60 //fast motor speed (analog)
#define SLOW 30 //slow motor speed (analog)
#define right 1 //rotation right
#define left 0 //rotation left
#define ramp 30 // distance between robot and a ramp
#define bottle 10 //distance between robot and a bottle

#define rotate90(Direction)\
{\
  if (Direction == 1)\
  {\
    motor(0,0,FAST,0);\
    delay(1000);\
  }\
  else\
  {\
    motor(FAST,0,0,0);\
    delay(1000);\
  }\
}
#define motor(speedMRF, speedMRB, speedMLF, speedMLB)\
{\
   analogWrite(MRF, speedMRF);\
   analogWrite(MRB, speedMRB);\
   analogWrite(MLF, speedMLF);\
   analogWrite(MLB, speedMLB);\
}
void setup() {
  //IR SENSORS
  pinMode (IRR, INPUT);
  pinMode (IRL, INPUT);
  //MOTORS
  pinMode (MRF, OUTPUT);
  pinMode (MRB, OUTPUT);
  pinMode (MLF, OUTPUT);
  pinMode (MLB, OUTPUT);
  //ULTRASONIC SENSOR
  pinMode (USECHO, INPUT);
  pinMode (USTRIG, OUTPUT);
  Serial.begin (9600);

}
void loop(){
  //IR Readings
  int RIR = digitalRead(IRL);
  int LIR = digitalRead(IRR);

  //Ultra Sonic;
  unsigned long duration, distance;
  digitalWrite(USTRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(USTRIG, LOW);
  duration = pulseIn(USECHO, HIGH);
  distance = (duration/2) / 29.1;

    Serial.print(distance);
    Serial.print(" cm////");
    Serial.print(RIR);
    Serial.print("  ");
    Serial.println(LIR);

  if (distance==bottle) //bottle
  {
    motor(0,SLOW,0,SLOW);
    rotate90(right);
    motor(SLOW,0,SLOW,0);
    delay(2000);
    rotate90(left);
    motor(SLOW,0,SLOW,0);
    delay(4000);
    rotate90(left);
    motor(SLOW,0,SLOW,0);
    delay(2000);
    rotate90(right);
  }
  else if (distance==ramp) //ramp
  {
    motor(FAST,0,FAST,0);
    delay(5000);
  }
  else //no ramp nor bottle is infront of robot
  {
    if (RIR == 1 && LIR == 1)
      {motor (FAST,0,FAST,0);}
    else if (RIR==1 && LIR ==0)
      {motor (SLOW,0,FAST,0);}
    else if (RIR==0 && LIR==1)
      {motor (FAST,0,SLOW,0);}
    else if (RIR==0 && LIR==0)
      {motor (0, SLOW, 0, SLOW);}
  }
}