Corona social distance meter

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

LiquidCrystal_I2C lcd(0x27,20,4);

UltraDistSensor mysensor;
float reading;

void setup() {
    lcd.init();                      // initialize the lcd 
    lcd.backlight();
    Serial.begin(9600);
    mysensor.attach(2,4);//Trigger pin , Echo pin
}

void loop() {
    lcd.clear();
    reading=mysensor.distanceInCm();
     lcd.setCursor(0,0);
     lcd.print("Distance :- ");
      lcd.print(reading);

      if(reading<100){
        lcd.setCursor(1,1);
     lcd.print("unsafty distance");
      lcd.print(reading);

      }

    delay(250);
}