Line follower robot with Arduino code

To make a Line follower robot, watch step by step video on my youtube channel: https://youtu.be/_SekCCU0_pc

Arduino code:

 #define LS 2 // left sensor
 #define RS 3 // right sensor
 #define LM1 5 // left motor M1a
 #define LM2 4 // left motor M2a
 #define RM1 7 // right motor M2a
 #define RM2 6 // right motor M2b
 void setup()
 {
 pinMode(LS, INPUT);
 pinMode(RS, INPUT);
 pinMode(LM1, OUTPUT);
 pinMode(LM2, OUTPUT);
 pinMode(RM1, OUTPUT);
 pinMode(RM2, OUTPUT);
 }
 void loop()
 {
 if(digitalRead(LS) && digitalRead(RS)) // Move Forward on line
 {
 digitalWrite(LM1, HIGH);
 digitalWrite(LM2, LOW);
 digitalWrite(RM1, HIGH);
 digitalWrite(RM2, LOW);
 }
 if(digitalRead(LS) && !(digitalRead(RS))) // turn left by  rotationg left motors in forward and right ones in backward direction
 {
 digitalWrite(LM1, HIGH);
 digitalWrite(LM2, LOW);
 digitalWrite(RM1, LOW);
 digitalWrite(RM2, HIGH);
 }
 if(!(digitalRead(LS)) && digitalRead(RS)) // Turn right by  rotating right motors in forward and left ones in backward direction
 {
 digitalWrite(LM1, LOW);
 digitalWrite(LM2, HIGH);
 digitalWrite(RM1, HIGH);
 digitalWrite(RM2, LOW);
 }
if(!(digitalRead(LS)) && !(digitalRead(RS))) // Finish line, stop both the motors
 {
 digitalWrite(LM1, LOW);
 digitalWrite(LM2, LOW);
 digitalWrite(RM1, LOW);
 digitalWrite(RM2, LOW);
 }
 }