Hello I'm new to this Arduino code here and my project was to do a line follower with robot Arm so I came up with the idea to separate these two to 2 code and then combine them in 1 but when I combine these two only my Robot Arm work and just after I'm not include Robot Arm in then the car go working so can someone explain to me please 
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Here is my code :
include <Servo.h>
// Khai báo động cơ
int S_A = 10; // tốc độ động cơ A
int M_A1 = 2; // động cơ A cực +
int M_A2 = 3; // động cơ A cực -
int M_B1 = 4; // động cơ B cực -
int M_B2 = 5; // động cơ B cực +
int S_B = 9; // tốc độ động cơ B
// Khai báo cảm biến
int R_S = A0; //sincer R
int S_S = A1; //sincer S
int L_S = A2; //sincer L
int pos1; //canh tay
int pos2; //khuy tay
int pos3; //co tay
int trigPin = A3;
int echoPin = A4;
int duration;
float d_cm;
Servo servo1;
Servo servo2;
Servo servo3;
void setup()
{
servo1.attach(11); // canh tay
servo2.attach(12); // khuy tay
servo3.attach(13); // co tay
servo2.write(150); //khuy tay goc bd
servo3.write(80); // co tay goc bd
servo1.write(20); // canh tay goc b
Serial.begin(9600);
// Cài đặt cảm biến siêu âm
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
// Cài đặt động cơ
pinMode(M_B1, OUTPUT);
pinMode(M_B2, OUTPUT);
pinMode(M_A1, OUTPUT);
pinMode(M_A2, OUTPUT);
pinMode(S_B, OUTPUT);
pinMode(S_A, OUTPUT);
pinMode(L_S, INPUT);
pinMode(S_S, INPUT);
pinMode(R_S, INPUT);
analogWrite(S_A, 150);
analogWrite(S_B, 150);
delay(200);
digitalWrite(M_A1, LOW);
digitalWrite(M_A2, HIGH);
digitalWrite(M_B1, HIGH);
digitalWrite(M_B2, LOW);
delay(4000);
}
void loop()
{
// Đo khoảng cách bằng cảm biến siêu âm
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
d_cm = duration * 0.034 / 2.;
Serial.print("Distance: ");
Serial.print(d_cm);
Serial.println(" cm");
// Nếu khoảng cách <= 10 cm, thực hiện gắp vật
if (d_cm <= 10) {
Stop();
delay(500);
Back();
delay(500);
gapVat();
delay(500);
turnLeft();
delay(1000);
forword();
delay(1500);
thaVat();
delay(500);
turnLeft();
delay(1500);
forword();
delay(2000);
}
if ((digitalRead(L_S) == 0)&&(digitalRead(S_S) == 1)&&(digitalRead(R_S) == 0)){forword();}
if ((digitalRead(L_S) == 1)&&(digitalRead(S_S) == 1)&&(digitalRead(R_S) == 0)){turnLeft();}
if ((digitalRead(L_S) == 1)&&(digitalRead(S_S) ==0)&&(digitalRead(R_S) == 0)) {turnLeft();}
if ((digitalRead(L_S) == 0)&&(digitalRead(S_S) == 1)&&(digitalRead(R_S) == 1)){turnRight();}
if ((digitalRead(L_S) == 0)&&(digitalRead(S_S) == 0)&&(digitalRead(R_S) == 1)){turnRight();}
if ((digitalRead(L_S) == 1)&&(digitalRead(S_S) == 1)&&(digitalRead(R_S) == 1)){turnLeft();}
}
void forword(){
digitalWrite(M_A1, LOW);
digitalWrite(M_A2, HIGH);
digitalWrite(M_B1, HIGH);
digitalWrite(M_B2, LOW);
}
void turnRight(){
digitalWrite(M_A1, LOW);
digitalWrite(M_A2, LOW);
digitalWrite(M_B1, HIGH);
digitalWrite(M_B2, LOW);
}
void turnLeft(){
digitalWrite(M_A1, LOW);
digitalWrite(M_A2, HIGH);
digitalWrite(M_B1, LOW);
digitalWrite(M_B2, LOW);
}
void Stop(){
digitalWrite(M_A1, LOW);
digitalWrite(M_A2, LOW);
digitalWrite(M_B1, LOW);
digitalWrite(M_B2, LOW);
}
void Back()
{
digitalWrite(M_A1, HIGH);
digitalWrite(M_A2, LOW);
digitalWrite(M_B1, LOW);
digitalWrite(M_B2, HIGH);
}
void gapVat()
{
for(pos2 = servo2.read();pos2 >=60;pos2 -=1.5 )
{servo2.write(pos2);
delay(100);
}
if (servo2.read()== 60){
for(pos3 = servo3.read();pos3 >=60;pos3 -=1 )
servo3.write(pos3);
delay(100);
}
delay(2000);
if (servo3.read()== 60){
for(pos1 = servo1.read();pos1 <=80;pos1 +=1 )
servo1.write(pos1);
delay(1000);
}
if (servo1.read()== 80){
for(pos3 = servo3.read();pos3 <=80;pos3 +=1 )
servo3.write(pos3);
delay(1000);
}
if (servo3.read()== 80){
for(pos2 = servo2.read();pos2 <=120;pos2 +=1 )
servo2.write(pos2);
delay(100);
}
}
void Thavat()
{
for(pos2 = servo2.read();pos2 >=100;pos2 -=1 ){
servo2.write(pos2);
delay(100);}
if (servo2.read()== 100){
for(pos1 = servo1.read();pos1 >=0;pos1 -=1 )
servo1.write(pos1);
delay(500);
if (servo1.read()== 0){
for(pos2 = servo2.read();pos2 <=150;pos2 +=1 )
servo2.write(pos2);
delay(100);
servo3.write(70); // co tay goc bd
servo1.write(20);
}
}
}