[Refactor] Eliminate warnings in Rust code

[felixfaisal]

Description
Currently, upon building any of the filters you get rust compilation warnings. We can eliminate these warnings and follow best practices of Rust.

Expected Behavior
Code compiles without any warnings

Screenshots

To Reproduce
Steps to reproduce the behavior:

• Compile any of the filters

[leecalcote]

Ouch. Good find. Yes. Would you like to take this on, @felixfaisal?

[felixfaisal]

I'd like to take this on @leecalcote :D

[leecalcote]

@felixfaisal, excellent. 😄

[acald-creator]

@Azanul I am but I'm still waiting on my PR to be accepted and merged.

[horizenight]

Hello @acald-creator @felixfaisal
Didn't any linked PRs to this issue, would like to review the PR ( if already solved ) or would like to solve it.

[felixfaisal]

Hey @horizenight I think you can take it up if the following PR does not solve it already - #49 but would be great if you double check it with @acald-creator
CC: @leecalcote