simplified packet construction by using concat instead of IoSlice

src/i3msg.rs

@@ -1,5 +1,4 @@
-use std::io::prelude::*;
-use std::io::{IoSlice, Result};
+use std::io::Result;
 
 pub struct I3msg<'payload> {
     magic_string: &'static str,
@@ -21,15 +20,14 @@ impl<'payload> I3msg<'payload> {
     pub fn construct_packet(&mut self) -> Result<Vec<u8>> {
         let length = self.payload.len().to_ne_bytes();
         let payload_type = self.payload_type.to_ne_bytes();
-        
-        let bufs = &mut [
-            IoSlice::new(self.magic_string.as_bytes()),
-            IoSlice::new(&length.as_slice()[..4]),
-            IoSlice::new(payload_type.as_slice()),
-            IoSlice::new(self.payload.as_bytes()),
-        ];
-
-        self.buffer.write_vectored(bufs)?;
+        self.buffer.append(
+            &mut [
+                self.magic_string.as_bytes().to_vec(),
+                length.as_slice()[..4].to_vec(),
+                payload_type.as_slice().to_vec(),
+                self.payload.as_bytes().to_vec(),
+            ].concat()
+        );
         Ok(self.buffer.to_owned())
     }
 }