basis code school

#include <IRremote.h>
#include <ir_Lego_PF_BitStreamEncoder.h>
#include <LCD-I2C.h>
#include <AccelStepper.h>
#include <Wire.h>


#define blue_button 3
#define black_button 2
#define setpper_1 4
#define setpper_2 5
#define setpper_3 6
#define setpper_4 7
#define FULLSTEP 4
#define ir_input 9

IRrecv IrReceiver(ir_input);
LCD_I2C lcd(0x27, 16, 2);

AccelStepper stepper(FULLSTEP, 7, 5, 6, 4);

void setup(){
  //#======pin=setup=========#//
      pinMode(blue_button, INPUT);
      pinMode(black_button, INPUT);

  //#======LCD=setup=========#//
      lcd.begin();
      lcd.clear();
      lcd.display();
      lcd.setCursor(0, 0);
      lcd.print("starting");
      lcd.backlight();

  //#======serial_begin======#//
      Serial.begin(9600);

  //#=======stepper==========#//
      stepper.setMaxSpeed(600);
      stepper.setSpeed(600);
      stepper.setAcceleration(100.0);
      stepper.moveTo(500);

  //#=====start=secuence=====#//
      delay(2000);
      lcd.clear();
      lcd.print("done");
      delay(700);
      lcd.clear();
}

void loop(){
  if (stepper.distanceToGo() == 0)
      stepper.moveTo(-stepper.currentPosition());
  stepper.run();
}