diff --git a/encoding/src/main.rs b/encoding/src/main.rs
index 2e0108b..2e038fd 100644
--- a/encoding/src/main.rs
+++ b/encoding/src/main.rs
@@ -5,6 +5,13 @@ use encoding::{
     DecoderTrap,
 };
 
+fn gbk_to_utf8_bytes(b: &[u8]) -> Option<Vec<u8>> {
+    match GBK.decode(b, DecoderTrap::Strict) {
+        Err(_) => None,
+        Ok(s) => Some(s.as_bytes().to_vec()),
+    }
+}
+
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let h_china = GBK.encode("Hello 中国", EncoderTrap::Strict)?;
 
@@ -14,5 +21,10 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     println!("{:?}", h_china);
     println!("{:?}", d_china);
 
+    let utf8_vec = gbk_to_utf8_bytes(&h_china[..]);
+    if let Some(u8_vec) = utf8_vec {
+        println!("{:?}", String::from_utf8(u8_vec)?);
+    }
+
     Ok(())
 }