Fix Main.tf Comment Handling on Windows

[X-Guardian]

Prerequisites

Put an x into the box(es) that apply:

• This pull request fixes a bug.
• This pull request adds a feature.
• This pull request introduces breaking change.

For more information, see the Contributing Guide.

Description

This pull request changes the method used for extracting the filename from the path to check if main.tf is being processed. The current path package used is not OS agnostic, whereas filepath is. See Package Filepath for further info.

Issues Resolved

#32

Checklist

Put an x into all boxes that apply:

• I have read the Contributing Guidelines.

Tests

• I have added tests to cover my changes.
• All tests pass when I run make test.

Documentation

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

Code Style

• My code follows the code style of this project.

[metmajer]

Great catch, @X-Guardian and thanks for the contribution!