Merge branch 'develop'

src/hands.rs

@@ -1,8 +1,10 @@
 pub fn handify(input: &str) -> String {
     let input = input.to_uppercase();
     let input = input.trim().to_owned();
-    let input = input.replace(" ", " 👏 ");
-    let input = format!("👏 {} 👏", input);
+    let mut input = input.replace(" ", " 👏 ");
+    if !input.is_empty() {
+        input = format!("👏 {} 👏", input);
+    }
     input
 }
 
@@ -17,3 +19,9 @@ fn handify_test_with_trailing_spaces() {
     let input = " hello world ";
     assert_eq!(handify(input), "👏 HELLO 👏 WORLD 👏")
 }
+
+#[test]
+fn handify_test_empty_string() {
+    let input = "";
+    assert_eq!(handify(input), "");
+}