meetup_rss: Create `join_nonempty` function

Move the join logic from `description_header` into a new function so we
can reuse it.

1 files changed, 7 insertions, 2 deletions

diff --git a/src/meetup_rss.rs b/src/meetup_rss.rs
index 80409f9..4055ac0 100644
--- a/src/meetup_rss.rs
+++ b/src/meetup_rss.rs
@@ -73,12 +73,17 @@ fn description_header(event: &Event) -> String {
         "".to_owned()
     };
 
-    [when, place]
+    join_nonempty(&[when, place], "\n")
+}
+
+/// Joins a slice of `String`s with `separator`, filtering out empty strings.
+fn join_nonempty(strings: &[String], separator: &str) -> String {
+    strings
         .iter()
         .filter(|s| !s.is_empty())
         .map(|s| s.to_owned())
         .collect::<Vec<String>>()
-        .join("\n")
+        .join(separator)
 }