brweber2

(defn comment? [s]
  (.startsWith s "#"))

(defn not-comment? [s]
  (not (comment? s))) ; you could also do (-> s comment? not), just showing alternatives, but what you had originally is just fine.

(defn remove-comments [file-contents]
  (filter not-comment? file-contents))

(defn nil-if-hyphen [s]