move out c/cpp/py

cl/_testrt/sum/in.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"github.com/goplus/lib/c"
+)
+
+func sum(args ...int) (ret int) {
+	for _, v := range args {
+		ret += v
+	}
+	return
+}
+
+func main() {
+	c.Printf(c.Str("Hello %d\n"), sum(1, 2, 3, 4))
+}