What's the best way to get a list of orders?

Question

Software design

At the moment I am writing a function to receive orders for both sides. There was a question to use one method or for each role separate.

+ Use one method, shortens the code, and code repetitions
- Although now these functions are very similar, it may change a lot in the future

Or now use one method, but when the path is heavily branched, make two methods based on the primary method.

Answer 1

Write a general function and two smaller ones that have differences. Then from the general call one of those two.

Answer 2

Good afternoon,
The process you describe is called refactoring. I advise light reading on this topic refactoring.guru
Also, there are general tips, the so-called principles, here is the first link in Google , superficially, but should be clear.
In answer to your question, there should be no code duplication. Do one method. Then, if, suddenly, a branch appears, then in this function there is a common code and two others appear, in which there will be a different code