From 13c442ec31bd1276d31473c4c63a536222955d3b Mon Sep 17 00:00:00 2001
From: Rock070 <a0938130702@gmail.com>
Date: Sat, 30 Dec 2023 16:49:44 +0800
Subject: [PATCH] Fix string manipulation functions

---
 exercises/09_strings/strings3.rs | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/exercises/09_strings/strings3.rs b/exercises/09_strings/strings3.rs
index b29f9325..d20ed963 100644
--- a/exercises/09_strings/strings3.rs
+++ b/exercises/09_strings/strings3.rs
@@ -3,21 +3,23 @@
 // Execute `rustlings hint strings3` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
-
 fn trim_me(input: &str) -> String {
     // TODO: Remove whitespace from both ends of a string!
-    ???
+    input.trim().to_string()
 }
 
 fn compose_me(input: &str) -> String {
     // TODO: Add " world!" to the string! There's multiple ways to do this!
-    ???
+    let mut s = String::new();
+    s.push_str(input);
+    s.push_str(" world!");
+
+    s
 }
 
 fn replace_me(input: &str) -> String {
     // TODO: Replace "cars" in the string with "balloons"!
-    ???
+    input.replace("cars", "balloons")
 }
 
 #[cfg(test)]