One solution to remove it is to use when.
(when (not (empty? s)
(println (str "Item: " (first s)))
(recur (rest s))))
As there is only one case for a when, you can give multiple
instructions for this case without grouping them
Even better:
(when-not (empty? s)
(println (str "Item: " (first s)))
(recur (rest s))))
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