the server_address in listening is no longer cloned

src/main.rs

@@ -3,23 +3,22 @@ use std::io::stdin;
 
 fn main() {
     let server_address: String = get_server_address();
-    listen(server_address);
+    listen(&server_address);
 }
 
 fn get_server_address() -> String {
     println!("Enter server address (format xxx.xxx.xxx.xxx:port)");
     let mut server_address = String::new();
     stdin().read_line(&mut server_address).expect("Reading the server address from input");
-    server_address = String::from(server_address.trim());
-    return server_address;
+    return server_address.trim().to_string();
 }
 
-fn listen(server_address: String) {
+fn listen(server_address: &str) {
     println!("listening on {}", server_address);
     loop {
         let mut message: String = String::new();
         let mut buf: [u8; 1024] = [0; 1024];
-        let socket: UdpSocket = UdpSocket::bind(server_address.clone()).expect("Error while binding the socket.");
+        let socket: UdpSocket = UdpSocket::bind(server_address).expect("Error while binding the socket.");
         let (num_bytes, src_addr) = socket.recv_from(&mut buf).expect("Error while receiving message");
         message.push_str(std::str::from_utf8(&buf[..num_bytes]).expect("Invalid UTF-8 data"));
         println!("{}:{}", src_addr.to_string(), message);