Finished go/two-fer

go/two-fer/two_fer.go

@@ -1,15 +1,13 @@
-// This is a "stub" file.  It's a little start on your solution.
-// It's not a complete solution though; you have to write some code.
-
-// Package twofer should have a package comment that summarizes what it's about.
-// https://golang.org/doc/effective_go.html#commentary
 package twofer
 
-// ShareWith needs a comment documenting it.
-func ShareWith(string) string {
-	// Write some code here to pass the test suite.
-	// Then remove all the stock comments.
-	// They're here to help you get started but they only clutter a finished solution.
-	// If you leave them in, reviewers will protest!
-	return ""
+import "fmt"
+
+// ShareWith just returns "One for <who>, one for me."
+// if <who> is empty, use "you"
+func ShareWith(who string) string {
+	ret := "One for %s, one for me."
+	if who == "" {
+		who = "you"
+	}
+	return fmt.Sprintf(ret, who)
 }