fixed error when the list is empty (#637)

* feat: Add Go code to binary search recursion under divide and conquer

* style: Code comment standardization

* style: modify function comment

* fix: fixed error when the list is empty

* Update print_utils.go

* Delete print_utils_test.go

---------

Co-authored-by: Yudong Jin <krahets@163.com>

codes/go/pkg/print_utils.go

@@ -19,6 +19,10 @@ func PrintSlice[T any](nums []T) {
 
 // PrintList Print a list
 func PrintList(list *list.List) {
+	if list.Len() == 0 {
+		fmt.Print("[]\n")
+		return
+	}
 	e := list.Front()
 	// 强转为 string, 会影响效率
 	fmt.Print("[")