Pet Feeder with arduino

int lmt1=3;
int lmt2=5;
int rmt1= 11;
int rmt2= 6;
int ls;
int cs;                            
int rs;
void setup() {
pinMode(3,OUTPUT);
pinMode(5,OUTPUT);
pinMode(11,OUTPUT);
pinMode(6,OUTPUT);
pinMode(7,INPUT);
pinMode(8,INPUT);
pinMode(9,INPUT);
  
  

}

void loop() {
  ls = digitalRead(7);
  cs = digitalRead(8);
  rs = digitalRead(9);
  if ( ls == LOW && cs == LOW && rs == LOW)
  {
    forward();
  }
  else if ( ls == HIGH
   
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
}
 void forward()
 {
  analogWrite(lmt1,150);
  analogWrite(lmt2,0);
  analogWrite(rmt1,150);
  analogWrite(rmt2,0);
 }
 void reverse()
 {
  analogWrite(lmt1,0);
  analogWrite(lmt2,150);
  analogWrite(rmt1,0);
  analogWrite(rmt2,150);
 }
 void left()
 {
  analogWrite(lmt1,150);
  analogWrite(lmt2,0);
  analogWrite(rmt1,0);
  analogWrite(rmt2,150;
 }
 void right ()
 {
  analogWrite(lmt1,0);
  analogWrite(lmt2,150);
  analogWrite(rmt1,150);
  analogWrite(rmt2,0);
 }
 void stp()
 {
  analogWrite(lmt1,0);
  analogWrite(lmt2,0);
  analogWrite(rmt1,0);
  analogWrite(rmt2,0);
 }
 void stpleft()
 {
  analogWrite(lmt1,150);
  analogWrite(lmt2,0);
  analogWrite(rmt1,0);
  analogWrite(rmt2,0);
 }
 void stpright()
 {
  analogWrite(lmt1,0);
  analogWrite(lmt2,0);
  analogWrite(rmt1,150);
  analogWrite(rmt2,0);
 }