fix typo

lib/src/commands.rs

@@ -554,7 +554,7 @@ impl Command for SendCommand {
         // If they can have different fees, you need to modify this logic.
         
         let default_fee: u64 = DEFAULT_FEE.try_into().unwrap(); 
-        let mut selected_fee, = default_fee;  
+        let mut selected_fee = default_fee;  
 
             for (_, _, _, fee) in send_args.iter() {
             if *fee != default_fee{