move out c/cpp/py

cl/_testrt/strlen/in.go

@@ -0,0 +1,17 @@
+package main
+
+import "C"
+import _ "unsafe"
+
+//go:linkname printf C.printf
+func printf(format *int8, __llgo_va_list ...any)
+
+//go:linkname strlen C.strlen
+func strlen(str *int8) C.int
+
+var format = [...]int8{'H', 'e', 'l', 'l', 'o', ' ', '%', 'd', '\n', 0}
+
+func main() {
+	sfmt := &format[0]
+	printf(sfmt, strlen(sfmt))
+}