[Haskell-beginners] Code Review of Caesar-Cipher

[chrysaetos99]

Background
----------
I am a total beginner in Haskell, so after reading the "Starting 
out"-chapter of "Learn you a Haskell", I wanted to create my first 
program that actually does something.

I decided to do the famous Caesar-Cipher.


Code
----
See attachment.


Question(s)

-----------

- How can this code be improved in general?
- Do I follow the style guide of Haskell (indentation, etc.)?
- I have a background in imperative languages. Did I do something that 
is untypical for functional programming languages?

I would appreciate any suggestions.

---

Please note: I also asked this question on 
https://codereview.stackexchange.com/questions/242529/caesar-cipher-implementation, 
but didn't receive an answer that really answered all my questions.


Kind regards

chrysaetos99


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