1 files changed, 45 insertions, 0 deletions
diff --git a/exercises/09_strings/strings3.rs b/exercises/09_strings/strings3.rs
new file mode 100644
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--- /dev/null
+++ b/exercises/09_strings/strings3.rs
@@ -0,0 +1,45 @@
+// strings3.rs
+//
+// 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!
+    ???
+}
+
+fn compose_me(input: &str) -> String {
+    // TODO: Add " world!" to the string! There's multiple ways to do this!
+    ???
+}
+
+fn replace_me(input: &str) -> String {
+    // TODO: Replace "cars" in the string with "balloons"!
+    ???
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn trim_a_string() {
+        assert_eq!(trim_me("Hello!     "), "Hello!");
+        assert_eq!(trim_me("  What's up!"), "What's up!");
+        assert_eq!(trim_me("   Hola!  "), "Hola!");
+    }
+
+    #[test]
+    fn compose_a_string() {
+        assert_eq!(compose_me("Hello"), "Hello world!");
+        assert_eq!(compose_me("Goodbye"), "Goodbye world!");
+    }
+
+    #[test]
+    fn replace_a_string() {
+        assert_eq!(replace_me("I think cars are cool"), "I think balloons are cool");
+        assert_eq!(replace_me("I love to look at cars"), "I love to look at balloons");
+    }
+}