rename to smartpack n smartunpack

examples/smartsend_example.rs

@@ -1,4 +1,4 @@
-use msghandler::{smartsend, Payload, SmartsendOptions};
+use msghandler::{smartpack, Payload, smartpackOptions};
 
 fn main() {
     // Create mixed payload data
@@ -24,7 +24,7 @@ fn main() {
         ),
     ];
 
-    let options = SmartsendOptions {
+    let options = smartpackOptions {
         broker_url: "localhost:4222".to_string(),
         fileserver_url: "http://localhost:8080".to_string(),
         msg_purpose: "chat".to_string(),
@@ -32,7 +32,7 @@ fn main() {
         ..Default::default()
     };
 
-    match smartsend("/agent/wine/api/v1/prompt", &payloads, &options) {
+    match smartpack("/agent/wine/api/v1/prompt", &payloads, &options) {
         Ok((envelope, json_str)) => {
             println!("=== Envelope Created ===");
             println!("Correlation ID: {}", envelope.correlation_id);