feat: Add Email class to validate and parse email address input

- Prompted user to input an email address using `Scanner`.
- Performed basic email format validation by checking presence of '@' and '.'.
- If valid, extracted:
  - Username (substring before '@')
  - Domain name (substring after '@')
- Printed extracted username and domain name.
- Added check to verify if domain starts with "Gmail" (case-sensitive).
- Further extracted and checked if domain equals "gmail" (case-insensitive) before the '.' character.
- Closed the Scanner object to release resources.

This class offers a simple yet effective way to parse email addresses and identify Gmail domains, useful for input validation and domain-specific processing.

Signed-off-by: Somesh diwan <[email protected]>

Author: Someshdiwan

Section6StringClassPrinting/src/Email.java

@@ -28,8 +28,6 @@ public static void main(String[] args) {
             String name = domainname.substring(0, j);
             System.out.println("Is it a valid Gmail domain (case-insensitive)? " + name.equalsIgnoreCase("gmail"));
         }
-
-        // Close the scanner
         scanner.close();
     }
 }