Hi, I am trying to understand macros and I am having trouble with the 
basics, I am working through some koans and I am stuck, an explanation not 
just a solution would be amazing.

I would like to create a macro that can provide the following

(if-else (> 5 2))
=> nil

(if-else (> 5 2) :then 'sure)
=> sure

(if-else (> 5 2) :else 'no-way :then 'sure)
=> sure

(if-else (> 5 2) :else 'no-way :then
  (println 'this-is-random) 'sure)
=> this is random
sure

I know this is not efficient and do would make more sense, but I am trying 
to understand a use case for this and how to accomplish this.

Thank you!

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