diff --git a/src/builtin/string.rs b/src/builtin/string.rs
index fb2b50c..c0da316 100644
--- a/src/builtin/string.rs
+++ b/src/builtin/string.rs
@@ -114,7 +114,14 @@ pub(crate) fn register(f: &mut HashMap<String, Builtin>) {
             if start > end || start > str_len {
                 Ok(Value::Ident(String::new(), quotes.normalize()))
             } else {
-                Ok(Value::Ident(string.chars().skip(start - 1).take(end - start + 1).collect(), quotes.normalize()))
+                Ok(Value::Ident(
+                    string
+                        .chars()
+                        .skip(start - 1)
+                        .take(end - start + 1)
+                        .collect(),
+                    quotes.normalize(),
+                ))
             }
         }),
     );