diff --git a/solutions/09_strings/strings4.rs b/solutions/09_strings/strings4.rs
index 9dc6917e..fe4733e3 100644
--- a/solutions/09_strings/strings4.rs
+++ b/solutions/09_strings/strings4.rs
@@ -1,6 +1,7 @@
 fn string_slice(arg: &str) {
     println!("{arg}");
 }
+
 fn string(arg: String) {
     println!("{arg}");
 }