parking project 4 cars

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Set the LCD address to 0x27 in PCF8574 by NXP and Set to 0x3F in PCF8574A by Ti
LiquidCrystal_I2C lcd(0x3F, 20, 4);

byte customChar9[] = {
  0x0E,
  0x1F,
  0x1F,
  0x0E,
  0x0E,
  0x1F,
  0x1F,
  0x0E
};





int ir1Pin = 3;
int ir1 =0;
int ir2Pin = 4;
int ir2 =0;
int ir3Pin = 5;
int ir3 =0;
int ir4Pin = 6;
int ir4 =0;

void setup() {
  lcd.begin();
  lcd.createChar(9, customChar9);
  lcd.home();
  pinMode(ir1Pin, INPUT);
  pinMode(ir2Pin, INPUT);
  pinMode(ir3Pin, INPUT);
  pinMode(ir4Pin, INPUT);
}






void loop() {
  ir1 = digitalRead(ir1Pin);
  ir2 = digitalRead(ir2Pin);
  ir3 = digitalRead(ir3Pin);
  ir4 = digitalRead(ir4Pin);

  lcd.setCursor(0, 0);
  lcd.print(" Parking Spots:");

  lcd.setCursor(2, 2);
  lcd.print("| 1 | 2 | 3 | 4 |");

  //car 1
  if(ir1==1){
  lcd.setCursor(4, 2);
  lcd.write(9);
  }else{}

  //car 2
  if(ir2==1){
  lcd.setCursor(8, 2);
  lcd.write(9);
  }else{}

  //car 3
  if(ir3==1){
  lcd.setCursor(12, 2);
  lcd.write(9);
  }else{}

  //car 4
  if(ir4==1){
  lcd.setCursor(16, 2);
  lcd.write(9);
  }else{}

  delay(800);
}