diff --git a/rw_combiner.go b/rw_combiner.go
deleted file mode 100644
index becc7f5..0000000
--- a/rw_combiner.go
+++ /dev/null
@@ -1,25 +0,0 @@
-package main
-
-import (
-	"io"
-)
-
-type combiner struct {
-	r io.Reader
-	w io.Writer
-}
-
-func newReadWriter(r io.Reader, w io.Writer) io.ReadWriter {
-	return &combiner{
-		r: r,
-		w: w,
-	}
-}
-
-func (c *combiner) Read(p []byte) (n int, err error) {
-	return c.r.Read(p)
-}
-
-func (c *combiner) Write(p []byte) (n int, err error) {
-	return c.w.Write(p)
-}