Update getFileType function

[DenisaCG]

Update getFileType function to consider directories which include . in their names (a false extension), when returning the object type, mimetype and format.

This PR builds on #34 and refactors the functionalities to integrate the directory check and remove redundancy.

[afshin]

Thank you!

Question for a future PR, can incrementName be made protected instead of public? Or do you need to use it externally as well?

[DenisaCG]

Thanks for the review!

can incrementName be made protected instead of public? Or do you need to use it externally as well?

Good point. I checked and it can be made protected, I will open a follow up PR addressing this. Thanks!