Solution

clojure/two-fer/src/two_fer.clj

@@ -1,5 +1,8 @@
 (ns two-fer)
 
-(defn two-fer [name] ;; <- arglist goes here
-  ;; your code goes here
-)
+(defn two-fer
+  ([] (two-fer "you"))
+  ([name]
+   (str (str "One for " name) ", one for me.")
+   )
+  )