There is a very silly mistake in system set property line. The 'w' of webdriver.chrome.driver should not be in upper case.
Use this:
System.setProperty("webdriver.chrome.driver", "C:\\Users\\extad7\\Downloads\\vAMSHI\\Chrome\\chromedriver.exe");
Instead of this:
System.setProperty("Webdriver.chrome.driver", "C:\\Users\\extad7\\Downloads\\vAMSHI\\Chrome\\chromedriver.exe");