diff --git a/main.go b/main.go
index c285317..b2c092c 100644
--- a/main.go
+++ b/main.go
@@ -1,10 +1,6 @@
 package main
 
-import (
-	"fmt"
-
-	. "github.com/ehlxr/leetcode-go/src"
-)
+import "fmt"
 
 func main() {
 	// node5 := &ListNode{Val: 5, Next: nil}
@@ -19,17 +15,11 @@ func main() {
 	// fmt.Printf("%v\n", ReverseRec(root))
 	// fmt.Printf("%v\n", ReverseKGroup(root, 2))
 
-	// s := "Hello 你好"
-	// println(s[2], s[6])
-	// rs := []rune(s)
-	// println(string(rs[6]))
+	s := "Hello 你好"
+	fmt.Println(s[2], s[6])
+	rs := []rune(s)
+	println(string(rs[6]))
 
 	// s := "babad"
 	// println(LongestPalindrome(s))
-
-	s := "bacbababaabcbab"
-	p := "ababa"
-	// fmt.Printf("%+v\n", GetNext(p))
-	fmt.Printf("%+v\n", Kmp(s, p))
-	fmt.Printf("%+v", Bf(s, p))
 }
diff --git a/src/string_match.go b/src/string_match.go
index ba9776d..f1d5dca 100644
--- a/src/string_match.go
+++ b/src/string_match.go
@@ -1,7 +1,7 @@
 package src
 
 // 暴力匹配
-func Bf(s, p string) int {
+func bf(s, p string) int {
 	n := len(s)
 	m := len(p)
 	if n < m {
@@ -25,13 +25,13 @@ func Bf(s, p string) int {
 	return -1
 }
 
-func Kmp(s, p string) int {
+func kmp(s, p string) int {
 	n := len(s)
 	m := len(p)
 	if n < m {
 		return -1
 	}
-	next := GetNext(p)
+	next := getNext(p)
 
 	for i := 0; i <= n-m; i++ {
 		j := 0
@@ -60,7 +60,7 @@ func Kmp(s, p string) int {
 	return -1
 }
 
-func GetNext(p string) []int {
+func getNext(p string) []int {
 	n := len(p)
 	next := make([]int, n)
 	next[0] = 0
diff --git a/src/string_match_test.go b/src/string_match_test.go
new file mode 100644
index 0000000..296ab11
--- /dev/null
+++ b/src/string_match_test.go
@@ -0,0 +1,28 @@
+package src
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestBf(t *testing.T) {
+	s := "bacbababaabcbab"
+	p := "ababa"
+
+	fmt.Printf("bf %s match %s index is: %+v\n", p, s, bf(s, p))
+	// t.Logf("%s match %s index is: %+v\n", p, s, bf(s, p))
+}
+
+func TestGetNext(t *testing.T) {
+	p := "ababa"
+	fmt.Printf("getNext %s next is: %+v\n", p, getNext(p))
+	// t.Logf("%s next is: %+v\n", p, next)
+}
+
+func TestKmp(t *testing.T) {
+	s := "bacbababaabcbab"
+	p := "ababa"
+
+	fmt.Printf("kmp %s match %s index is: %+v\n", p, s, kmp(s, p))
+	// t.Logf("%s match %s index is: %+v\n", p, s, kmp(s, p))
+}