#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
String message = "Hello World!";

void setup() {
  lcd.init();
}

void loop() {
  int i = 0;
  for (i = 0; i < 16; i++) {
    lcd.clear();
    lcd.setCursor(16-i, 0);
    lcd.print(message);
    delay(500);
  }
 for (i = 0; i < 12; i++) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(message.substring(i, i + 16));
    delay(500);
 }

}