here is with reference, so it can be called more than once

src/main.rs

@@ -1,8 +1,9 @@
-fn say_hello(name: String) {
+fn say_hello(name: &str) {
     println!("{}", name);
 }
 
 fn main() {
     let name = String::from("alice");
-    say_hello(name);
+    say_hello(&name);
+    say_hello(&name);
 }