move out c/cpp/py

cl/_testlibgo/bytes/in.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"bytes"
+)
+
+func main() {
+	var b bytes.Buffer // A Buffer needs no initialization.
+	b.Write([]byte("Hello "))
+	b.WriteString("World")
+
+	println("buf", b.Bytes(), b.String())
+
+	println(bytes.EqualFold([]byte("Go"), []byte("go")))
+}