refactor client byte write / read

src/commands/expire.rs

@@ -22,7 +22,7 @@ impl Expire {
     }
 
     pub fn parse(buf: &mut Cursor<&[u8]>) -> Result<Self> {
-        let key = buf.try_get_string()?;
+        let key = buf.try_get_short_string()?;
         let seconds = buf.try_get_u64()?;
 
         Ok(Self { key, seconds })