[FIX] Invalid domain part allowed in email during Registration

[johnson-oragui]

Describe the bug
During user registration, the local part of the email is properly validated, as well as the domain part, but any extra character addition to the domain part is allowed(not properly validated) for example [email protected] is currently allowed.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'https://staging.api-python.boilerplate.hng.tech/register'
2. Enter your details
3. Add an extra '.com' to the domain part as many times
4. Click on register
5. Registration is successful

Expected behavior
The server is supposed to respond with "Invalid email" or a message of the same likeness.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• Browser chrome
• Version 22

ENTERED [email protected] DURING REGISTRATION

SERVER ALLOWED REGISTRATION

Additional context
The backend should not allow such invalid emails to be registered in the platform