Refactor code

[treere]

This is only a code refactoring.

The main change is that i changed the pattern:

%Stuff{} |> set_a(data) |> set_b(data) |> set_c(data)

Into

%Stuff{a: create_a(data), b: create_b(data)}

I did this because set_a function is more complex than create_a and it is explicit that to create the a value I use only data.