Solution:

1. Create a new Project in Eclipse.
2. Add the required libraries for Selenium.

Now in first you need to create an interface: driver

import org.apache.log4j.Logger;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.interactions.Action;
import org.openqa.selenium.remote.DesiredCapabilities;

public interface driver {
	
	public  WebDriver wd = new FirefoxDriver();
	public static String baseURL = "http://automationpractice.com/index.php";
	public static String driverPath = "F:\\Work Environment\\MyProject\\gekodriver\\geckodriver.exe";
	public void CallDriver();
	public static String email = "rahul@gmail.com";
	public static String password = "pass1234";
	public static Logger log  = Logger.getLogger(driver.class.getName());
	public static WebElement mainMenu = null;
	public static Action actions = null;
}

Now create a new TestNG Class and enter the following script:

import org.testng.annotations.Test;
import org.testng.annotations.BeforeTest;
import org.openqa.selenium.By;
import org.openqa.selenium.WebElement;
import org.testng.Assert;
import org.testng.annotations.AfterTest;

public class Search1 implements driver {
	public static WebElement se;
  
  @BeforeTest
  public void CallDriver() {
	  
	  System.setProperty("webdriver.gecko.driver",driverPath );
	  wd.manage().window().maximize();
	  wd.get("https://www.amazon.com/");
	  log.debug("Navigated to Amazon.com");
  }
  
  @Test
  public void TestSearch() {
	  WebElement se = wd.findElement(By.id("twotabsearchtextbox"));
	  se.sendKeys("iphone");
	  log.debug("Entered a keyword to search");
	  
	  wd.findElement(By.id("nav-search-submit-button")).click();
	  log.debug("Search button is clicked");
	  
	  
  }
  
  @Test
  public void TestSearch1() {
	  
	  String actRe = wd.getCurrentUrl();
	  String exres = "https://www.amazon.com/s?k=iphone&ref=nb_sb_noss_2";
		  Assert.assertEquals(actRe,exres);
	  se.clear();  
  }
  
  @Test
  public void TestSearch2() {
	  wd.navigate().back();
	  log.debug("nvigated back to previous page");
	 System.out.println(wd.getCurrentUrl());
  }
  

  @AfterTest
  public void afterTest() {
	  wd.quit();
  }


}