Remove explicit returns to simplify code

[jevonmao]

Since Swift 5.1, SE-0255 evolved Swift to have the capability to implicitly return from functions.

I removed unnecessary explicit returns to improve code readability and simplicity.

[ldiqual]

I'm no longer very active in the swift world but whatever language we're working with, I think having return is more explicit and clearer than not having it. Ultimately it comes down to taste so I'll defer to @JannThomas and @SplittyDev, but what I'd like to push for is to add swiftlint to the repo and enforce one style or the other – so that there's no debate about it in future PRs.

[jevonmao]

@ldiqual I understand your perspective. Ultimately is your's and the maintainer's call. I am not sure if SwiftLint supports this particular return scenario, but I agree, that adding SwiftLint is a good idea.

[SplittyDev]

I'm personally a fan of not having explicit return statements. In my opinion - since the return type is in the function signature and it's clear that the expression returns - there's no ambiguity there. Let's wait for @JannThomas and see what he prefers.

[JannThomas]

To be honest, I don't have a strong personal opinion on this, but this is where the Swift community is going and I think we should probably adopt it if only for that reason.

[SplittyDev]

LGTM 🚀

[JannThomas]

That said lets also add SwiftLint, I created Issue #107 for that and will work on it I the coming days.