Duplication in mediator handlers

[hanigamini]

How to use duplicate code in handler?
Does the static method take up a lot of memory when a lot of data is exchanged?
Base on @ShreyasJejurkar
It's not recommended to send another request from request handlers. The purpose of using MeditR is just to convert HTTP requests to our application-specific requests and send them into the application layer without letting the controller knows about it or any other presentation layer.

What is the best solution to not occupy a lot of memory?
Static method or utility class or service or Application services or abstraction layers or domain layer?

What is the code you suggest?