Changed Exclude String filters in favour of Callback Functions.

[aliumujib]

Context:

Relates to #203

[prabirshrestha]

Can we use a callback function instead to filter? This allows it to easily be customizable to any logic.

[aliumujib]

Can we use a callback function instead to filter? This allows it to easily be customizable to any logic.

Great idea! @prabirshrestha . I have updated the PR to use a callback function.

[prabirshrestha]

Can we combine fille filter and dir filter together and take an object instead of &str. In the future we may have other options such as symbolic link.

[aliumujib]

Can we combine fille filter and dir filter together and take an object instead of &str. In the future we may have other options such as symbolic link.

Done! @prabirshrestha

[prabirshrestha]

Merged. Thanks!