Added is_valid_email_address.rs

[lyqio]

Changes

• add is_valid_email_address.rs

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• I ran bellow commands using the latest version of rust nightly.
• I ran cargo clippy --all -- -D warnings just before my last commit and fixed any issue that was found.
• I ran cargo fmt just before my last commit.
• I ran cargo test just before my last commit and all tests passed.
• I added my algorithm to the corresponding mod.rs file within its own folder, and in any parent folder(s).
• I added my algorithm to DIRECTORY.md with the correct link.
• I checked COUNTRIBUTING.md and my code follows its guidelines.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.95122% with 5 lines in your changes missing coverage. Please review.

Project coverage is 95.34%. Comparing base (b2acfd2) to head (5460340).

Files with missing lines	Patch %	Lines
src/string/is_valid_email_address.rs	96.95%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #783      +/-   ##
==========================================
+ Coverage   95.33%   95.34%   +0.01%     
==========================================
  Files         310      311       +1     
  Lines       22657    22821     +164     
==========================================
+ Hits        21600    21759     +159     
- Misses       1057     1062       +5     

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[vil02]

The definition of the valid email address is slightly more involved, cf. https://en.wikipedia.org/wiki/Email_address#Examples
in particular, "john..doe"@example.org is perfectly fine.

This can be merged only if all of the edge cases are covered.

[lyqio]

I rewrote some of the code and now passes all of the tests on https://en.wikipedia.org/wiki/Email_address#Examples

[vil02]

Please make sure that tests cover all of the lines.

[lyqio]

I handled all the things that you requested.

[vil02]

Please make sure to update your branch (cf. #789) - otherwise the CI will fail.

[lyqio]

I think I fixed all the issues and made the IP checking better.

[vil02]

Please consider using more consistent naming: sometime the valid part is in the middle and sometimes at the end. Perhaps it is not needed at all?