Enhanced email address validator

[brendanddev]

Description

The following pull request improves the existing email address validator script logic. The logic changes to the script consist of now checking for only one '@' symbol, and that the '@' symbol is not the first, or last characters in the string. Additionally it now ensures that at least a period appears after the '@', and that it is not the last character.

Fixes #(issue_no)

• Not applicable

Type of change

Choosing one or more options from the following as per the nature of your Pull request.

• New project insert
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation Update

Checklist:

Please tick all the boxes that are fulfilled by your Pull Request.

• I have named my files and folder, according to this project's guidelines.
• [x ] My code follows the style guidelines of this project.
• I have commented on my code, particularly in hard-to-understand areas.
• [] I have created a helpful and easy to understand README.md, according to the given README_TEMPLATE.
• My changes do not produce any warnings.

[brendanddev]

Did not create new README, altered existing code and did not create a new project.