diff --git a/ch2-cgo/ch2-03-cgo-types.md b/ch2-cgo/ch2-03-cgo-types.md
index ab5a188..de3f140 100644
--- a/ch2-cgo/ch2-03-cgo-types.md
+++ b/ch2-cgo/ch2-03-cgo-types.md
@@ -322,32 +322,36 @@ type SliceHeader struct {
 
 ```go
 /*
-static char arr[10];
-static char *s = "Hello";
+#include <string.h>
+char arr[10];
+char *s = "Hello";
 */
 import "C"
 import (
-	"reflect"
-	"unsafe"
+    "reflect"
+    "unsafe"
+    "fmt"
 )
+
 func main() {
-	// 通过 reflect.SliceHeader 转换
-	var arr0 []byte
-	var arr0Hdr = (*reflect.SliceHeader)(unsafe.Pointer(&arr0))
-	arr0Hdr.Data = uintptr(unsafe.Pointer(&C.arr[0]))
-	arr0Hdr.Len = 10
-	arr0Hdr.Cap = 10
+    // chuyển đổi bằng reflect.SliceHeader
+    var arr0 []byte
+    var arr0Hdr = (*reflect.SliceHeader)(unsafe.Pointer(&arr0))
+    arr0Hdr.Data = uintptr(unsafe.Pointer(&C.arr[0]))
+    arr0Hdr.Len = 10
+    arr0Hdr.Cap = 10
 
-	// 通过切片语法转换
-	arr1 := (*[31]byte)(unsafe.Pointer(&C.arr[0]))[:10:10]
+    // chuyển đổi slice
+    arr1 := (*[31]byte)(unsafe.Pointer(&C.arr[0]))[:10:10]
 
-	var s0 string
-	var s0Hdr = (*reflect.StringHeader)(unsafe.Pointer(&s0))
-	s0Hdr.Data = uintptr(unsafe.Pointer(C.s))
-	s0Hdr.Len = int(C.strlen(C.s))
 
-	sLen := int(C.strlen(C.s))
-	s1 := string((*[31]byte)(unsafe.Pointer(&C.s[0]))[:sLen:sLen])
+    var s0 string
+    var s0Hdr = (*reflect.StringHeader)(unsafe.Pointer(&s0))
+    s0Hdr.Data = uintptr(unsafe.Pointer(C.s))
+    s0Hdr.Len = int(C.strlen(C.s))
+
+    sLen := int(C.strlen(C.s))
+    s1 := string((*[31]byte)(unsafe.Pointer(C.s))[:sLen:sLen])
 }
 ```