Extract method for common code and make signatures swiftier

	2 Warnings
:warning:	If this is a user-facing change, please include a CHANGELOG entry to credit yourself! You can find it at CHANGELOG.md.
:warning:	This PR may need tests.

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Here's an example of your CHANGELOG entry:

* Extract method for common code and make signatures swiftier.  
  [SimplyDanny](https://github.com/SimplyDanny)
  [#issue_number](https://github.com/realm/SwiftLint/issues/issue_number)

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realm / SwiftLint

Extract method for common code and make signatures swiftier #5554