diff --git a/docs/convertor.md b/docs/convertor.md
index 7084360..b49fc56 100644
--- a/docs/convertor.md
+++ b/docs/convertor.md
@@ -652,45 +652,45 @@ import (
 
 func main() {
     type Struct struct {
-		Str        string
-		Int        int
-		Float      float64
-		Bool       bool
-		Nil        interface{}
-		unexported string
-	}
+        Str        string
+        Int        int
+        Float      float64
+        Bool       bool
+        Nil        interface{}
+        unexported string
+    }
 
-	cases := []interface{}{
-		true,
-		1,
-		0.1,
-		map[string]int{
-			"a": 1,
-			"b": 2,
-		},
-		&Struct{
-			Str:   "test",
-			Int:   1,
-			Float: 0.1,
-			Bool:  true,
-			Nil:   nil,
-			// unexported: "can't be cloned",
-		},
-	}
+    cases := []interface{}{
+        true,
+        1,
+        0.1,
+        map[string]int{
+            "a": 1,
+            "b": 2,
+        },
+        &Struct{
+            Str:   "test",
+            Int:   1,
+            Float: 0.1,
+            Bool:  true,
+            Nil:   nil,
+            // unexported: "can't be cloned",
+        },
+    }
 
-	for _, item := range cases {
-		cloned := convertor.DeepClone(item)
+    for _, item := range cases {
+        cloned := convertor.DeepClone(item)
 
-		isPointerEqual := &cloned == &item
-		fmt.Println(cloned, isPointerEqual)
-	}
+        isPointerEqual := &cloned == &item
+        fmt.Println(cloned, isPointerEqual)
+    }
 
-	// Output:
-	// true false
-	// 1 false
-	// 0.1 false
-	// map[a:1 b:2] false
-	// &{test 1 0.1 true <nil> } false
+    // Output:
+    // true false
+    // 1 false
+    // 0.1 false
+    // map[a:1 b:2] false
+    // &{test 1 0.1 true <nil> } false
 }
 ```
 
@@ -717,43 +717,43 @@ import (
 
 func main() {
     type Address struct {
-		Country string
-		ZipCode string
-	}
+        Country string
+        ZipCode string
+    }
 
-	type User struct {
-		Name   string
-		Age    int
-		Role   string
-		Addr   Address
-		Hobbys []string
-		salary int
-	}
+    type User struct {
+        Name   string
+        Age    int
+        Role   string
+        Addr   Address
+        Hobbys []string
+        salary int
+    }
 
-	type Employee struct {
-		Name   string
-		Age    int
-		Role   string
-		Addr   Address
-		Hobbys []string
-		salary int
-	}
+    type Employee struct {
+        Name   string
+        Age    int
+        Role   string
+        Addr   Address
+        Hobbys []string
+        salary int
+    }
 
-	user := User{Name: "user001", Age: 10, Role: "Admin", Addr: Address{Country: "CN", ZipCode: "001"}, Hobbys: []string{"a", "b"}, salary: 1000}
+    user := User{Name: "user001", Age: 10, Role: "Admin", Addr: Address{Country: "CN", ZipCode: "001"}, Hobbys: []string{"a", "b"}, salary: 1000}
 
-	employee1 := Employee{}
-	CopyProperties(&employee1, &user)
+    employee1 := Employee{}
+    CopyProperties(&employee1, &user)
 
-	employee2 := Employee{Name: "employee001", Age: 20, Role: "User",
-		Addr: Address{Country: "UK", ZipCode: "002"}, salary: 500}
+    employee2 := Employee{Name: "employee001", Age: 20, Role: "User",
+        Addr: Address{Country: "UK", ZipCode: "002"}, salary: 500}
 
-	CopyProperties(&employee2, &user)
+    CopyProperties(&employee2, &user)
 
-	fmt.Println(employee1)
-	fmt.Println(employee2)
+    fmt.Println(employee1)
+    fmt.Println(employee2)
 
-	// Output:
-	// {user001 10 Admin {CN 001} [a b] 0}
-	// {user001 10 Admin {CN 001} [a b] 500}
+    // Output:
+    // {user001 10 Admin {CN 001} [a b] 0}
+    // {user001 10 Admin {CN 001} [a b] 500}
 }
 ```
\ No newline at end of file
diff --git a/docs/convertor_zh-CN.md b/docs/convertor_zh-CN.md
index 17220b1..9257092 100644
--- a/docs/convertor_zh-CN.md
+++ b/docs/convertor_zh-CN.md
@@ -652,45 +652,45 @@ import (
 
 func main() {
     type Struct struct {
-		Str        string
-		Int        int
-		Float      float64
-		Bool       bool
-		Nil        interface{}
-		unexported string
-	}
+        Str        string
+        Int        int
+        Float      float64
+        Bool       bool
+        Nil        interface{}
+        unexported string
+    }
 
-	cases := []interface{}{
-		true,
-		1,
-		0.1,
-		map[string]int{
-			"a": 1,
-			"b": 2,
-		},
-		&Struct{
-			Str:   "test",
-			Int:   1,
-			Float: 0.1,
-			Bool:  true,
-			Nil:   nil,
-			// unexported: "can't be cloned",
-		},
-	}
+    cases := []interface{}{
+        true,
+        1,
+        0.1,
+        map[string]int{
+            "a": 1,
+            "b": 2,
+        },
+        &Struct{
+            Str:   "test",
+            Int:   1,
+            Float: 0.1,
+            Bool:  true,
+            Nil:   nil,
+            // unexported: "can't be cloned",
+        },
+    }
 
-	for _, item := range cases {
-		cloned := convertor.DeepClone(item)
+    for _, item := range cases {
+        cloned := convertor.DeepClone(item)
 
-		isPointerEqual := &cloned == &item
-		fmt.Println(cloned, isPointerEqual)
-	}
+        isPointerEqual := &cloned == &item
+        fmt.Println(cloned, isPointerEqual)
+    }
 
-	// Output:
-	// true false
-	// 1 false
-	// 0.1 false
-	// map[a:1 b:2] false
-	// &{test 1 0.1 true <nil> } false
+    // Output:
+    // true false
+    // 1 false
+    // 0.1 false
+    // map[a:1 b:2] false
+    // &{test 1 0.1 true <nil> } false
 }
 ```
 
@@ -716,43 +716,43 @@ import (
 
 func main() {
     type Address struct {
-		Country string
-		ZipCode string
-	}
+        Country string
+        ZipCode string
+    }
 
-	type User struct {
-		Name   string
-		Age    int
-		Role   string
-		Addr   Address
-		Hobbys []string
-		salary int
-	}
+    type User struct {
+        Name   string
+        Age    int
+        Role   string
+        Addr   Address
+        Hobbys []string
+        salary int
+    }
 
-	type Employee struct {
-		Name   string
-		Age    int
-		Role   string
-		Addr   Address
-		Hobbys []string
-		salary int
-	}
+    type Employee struct {
+        Name   string
+        Age    int
+        Role   string
+        Addr   Address
+        Hobbys []string
+        salary int
+    }
 
-	user := User{Name: "user001", Age: 10, Role: "Admin", Addr: Address{Country: "CN", ZipCode: "001"}, Hobbys: []string{"a", "b"}, salary: 1000}
+    user := User{Name: "user001", Age: 10, Role: "Admin", Addr: Address{Country: "CN", ZipCode: "001"}, Hobbys: []string{"a", "b"}, salary: 1000}
 
-	employee1 := Employee{}
-	CopyProperties(&employee1, &user)
+    employee1 := Employee{}
+    CopyProperties(&employee1, &user)
 
-	employee2 := Employee{Name: "employee001", Age: 20, Role: "User",
-		Addr: Address{Country: "UK", ZipCode: "002"}, salary: 500}
+    employee2 := Employee{Name: "employee001", Age: 20, Role: "User",
+        Addr: Address{Country: "UK", ZipCode: "002"}, salary: 500}
 
-	CopyProperties(&employee2, &user)
+    CopyProperties(&employee2, &user)
 
-	fmt.Println(employee1)
-	fmt.Println(employee2)
+    fmt.Println(employee1)
+    fmt.Println(employee2)
 
-	// Output:
-	// {user001 10 Admin {CN 001} [a b] 0}
-	// {user001 10 Admin {CN 001} [a b] 500}
+    // Output:
+    // {user001 10 Admin {CN 001} [a b] 0}
+    // {user001 10 Admin {CN 001} [a b] 500}
 }
 ```
\ No newline at end of file
diff --git a/docs/strutil.md b/docs/strutil.md
index e19b741..6821a12 100644
--- a/docs/strutil.md
+++ b/docs/strutil.md
@@ -472,28 +472,28 @@ import (
 
 func main() {
     result1 := strutil.Pad("foo", 1, "bar")
-	result2 := strutil.Pad("foo", 2, "bar")
-	result3 := strutil.Pad("foo", 3, "bar")
-	result4 := strutil.Pad("foo", 4, "bar")
-	result5 := strutil.Pad("foo", 5, "bar")
-	result6 := strutil.Pad("foo", 6, "bar")
-	result7 := strutil.Pad("foo", 7, "bar")
+    result2 := strutil.Pad("foo", 2, "bar")
+    result3 := strutil.Pad("foo", 3, "bar")
+    result4 := strutil.Pad("foo", 4, "bar")
+    result5 := strutil.Pad("foo", 5, "bar")
+    result6 := strutil.Pad("foo", 6, "bar")
+    result7 := strutil.Pad("foo", 7, "bar")
 
-	fmt.Println(result1)
-	fmt.Println(result2)
-	fmt.Println(result3)
-	fmt.Println(result4)
-	fmt.Println(result5)
-	fmt.Println(result6)
-	fmt.Println(result7)
-	// Output:
-	// foo
-	// foo
-	// foo
-	// foob
-	// bfoob
-	// bfooba
-	// bafooba
+    fmt.Println(result1)
+    fmt.Println(result2)
+    fmt.Println(result3)
+    fmt.Println(result4)
+    fmt.Println(result5)
+    fmt.Println(result6)
+    fmt.Println(result7)
+    // Output:
+    // foo
+    // foo
+    // foo
+    // foob
+    // bfoob
+    // bfooba
+    // bafooba
 }
 ```
 
@@ -872,26 +872,26 @@ import (
 
 func main() {
     result1 := strutil.SplitWords("a word")
-	result2 := strutil.SplitWords("I'am a programmer")
-	result3 := strutil.SplitWords("Bonjour, je suis programmeur")
-	result4 := strutil.SplitWords("a -b-c' 'd'e")
-	result5 := strutil.SplitWords("你好，我是一名码农")
-	result6 := strutil.SplitWords("こんにちは，私はプログラマーです")
+    result2 := strutil.SplitWords("I'am a programmer")
+    result3 := strutil.SplitWords("Bonjour, je suis programmeur")
+    result4 := strutil.SplitWords("a -b-c' 'd'e")
+    result5 := strutil.SplitWords("你好，我是一名码农")
+    result6 := strutil.SplitWords("こんにちは，私はプログラマーです")
 
-	fmt.Println(result1)
-	fmt.Println(result2)
-	fmt.Println(result3)
-	fmt.Println(result4)
-	fmt.Println(result5)
-	fmt.Println(result6)
+    fmt.Println(result1)
+    fmt.Println(result2)
+    fmt.Println(result3)
+    fmt.Println(result4)
+    fmt.Println(result5)
+    fmt.Println(result6)
 
-	// Output:
-	// [a word]
-	// [I'am a programmer]
-	// [Bonjour je suis programmeur]
-	// [a b-c' d'e]
-	// []
-	// []
+    // Output:
+    // [a word]
+    // [I'am a programmer]
+    // [Bonjour je suis programmeur]
+    // [a b-c' d'e]
+    // []
+    // []
 }
 ```
 
@@ -916,25 +916,25 @@ import (
 
 func main() {
     result1 := strutil.WordCount("a word")
-	result2 := strutil.WordCount("I'am a programmer")
-	result3 := strutil.WordCount("Bonjour, je suis programmeur")
-	result4 := strutil.WordCount("a -b-c' 'd'e")
-	result5 := strutil.WordCount("你好，我是一名码农")
-	result6 := strutil.WordCount("こんにちは，私はプログラマーです")
+    result2 := strutil.WordCount("I'am a programmer")
+    result3 := strutil.WordCount("Bonjour, je suis programmeur")
+    result4 := strutil.WordCount("a -b-c' 'd'e")
+    result5 := strutil.WordCount("你好，我是一名码农")
+    result6 := strutil.WordCount("こんにちは，私はプログラマーです")
 
-	fmt.Println(result1)
-	fmt.Println(result2)
-	fmt.Println(result3)
-	fmt.Println(result4)
-	fmt.Println(result5)
-	fmt.Println(result6)
+    fmt.Println(result1)
+    fmt.Println(result2)
+    fmt.Println(result3)
+    fmt.Println(result4)
+    fmt.Println(result5)
+    fmt.Println(result6)
 
-	// Output:
-	// 2
-	// 3
-	// 4
-	// 3
-	// 0
-	// 0
+    // Output:
+    // 2
+    // 3
+    // 4
+    // 3
+    // 0
+    // 0
 }
 ```
\ No newline at end of file
diff --git a/docs/strutil_zh-CN.md b/docs/strutil_zh-CN.md
index 7d9cd24..623e555 100644
--- a/docs/strutil_zh-CN.md
+++ b/docs/strutil_zh-CN.md
@@ -471,28 +471,28 @@ import (
 
 func main() {
     result1 := strutil.Pad("foo", 1, "bar")
-	result2 := strutil.Pad("foo", 2, "bar")
-	result3 := strutil.Pad("foo", 3, "bar")
-	result4 := strutil.Pad("foo", 4, "bar")
-	result5 := strutil.Pad("foo", 5, "bar")
-	result6 := strutil.Pad("foo", 6, "bar")
-	result7 := strutil.Pad("foo", 7, "bar")
+    result2 := strutil.Pad("foo", 2, "bar")
+    result3 := strutil.Pad("foo", 3, "bar")
+    result4 := strutil.Pad("foo", 4, "bar")
+    result5 := strutil.Pad("foo", 5, "bar")
+    result6 := strutil.Pad("foo", 6, "bar")
+    result7 := strutil.Pad("foo", 7, "bar")
 
-	fmt.Println(result1)
-	fmt.Println(result2)
-	fmt.Println(result3)
-	fmt.Println(result4)
-	fmt.Println(result5)
-	fmt.Println(result6)
-	fmt.Println(result7)
-	// Output:
-	// foo
-	// foo
-	// foo
-	// foob
-	// bfoob
-	// bfooba
-	// bafooba
+    fmt.Println(result1)
+    fmt.Println(result2)
+    fmt.Println(result3)
+    fmt.Println(result4)
+    fmt.Println(result5)
+    fmt.Println(result6)
+    fmt.Println(result7)
+    // Output:
+    // foo
+    // foo
+    // foo
+    // foob
+    // bfoob
+    // bfooba
+    // bafooba
 }
 ```
 
@@ -870,26 +870,26 @@ import (
 
 func main() {
     result1 := strutil.SplitWords("a word")
-	result2 := strutil.SplitWords("I'am a programmer")
-	result3 := strutil.SplitWords("Bonjour, je suis programmeur")
-	result4 := strutil.SplitWords("a -b-c' 'd'e")
-	result5 := strutil.SplitWords("你好，我是一名码农")
-	result6 := strutil.SplitWords("こんにちは，私はプログラマーです")
+    result2 := strutil.SplitWords("I'am a programmer")
+    result3 := strutil.SplitWords("Bonjour, je suis programmeur")
+    result4 := strutil.SplitWords("a -b-c' 'd'e")
+    result5 := strutil.SplitWords("你好，我是一名码农")
+    result6 := strutil.SplitWords("こんにちは，私はプログラマーです")
 
-	fmt.Println(result1)
-	fmt.Println(result2)
-	fmt.Println(result3)
-	fmt.Println(result4)
-	fmt.Println(result5)
-	fmt.Println(result6)
+    fmt.Println(result1)
+    fmt.Println(result2)
+    fmt.Println(result3)
+    fmt.Println(result4)
+    fmt.Println(result5)
+    fmt.Println(result6)
 
-	// Output:
-	// [a word]
-	// [I'am a programmer]
-	// [Bonjour je suis programmeur]
-	// [a b-c' d'e]
-	// []
-	// []
+    // Output:
+    // [a word]
+    // [I'am a programmer]
+    // [Bonjour je suis programmeur]
+    // [a b-c' d'e]
+    // []
+    // []
 }
 ```
 
@@ -914,25 +914,25 @@ import (
 
 func main() {
     result1 := strutil.WordCount("a word")
-	result2 := strutil.WordCount("I'am a programmer")
-	result3 := strutil.WordCount("Bonjour, je suis programmeur")
-	result4 := strutil.WordCount("a -b-c' 'd'e")
-	result5 := strutil.WordCount("你好，我是一名码农")
-	result6 := strutil.WordCount("こんにちは，私はプログラマーです")
+    result2 := strutil.WordCount("I'am a programmer")
+    result3 := strutil.WordCount("Bonjour, je suis programmeur")
+    result4 := strutil.WordCount("a -b-c' 'd'e")
+    result5 := strutil.WordCount("你好，我是一名码农")
+    result6 := strutil.WordCount("こんにちは，私はプログラマーです")
 
-	fmt.Println(result1)
-	fmt.Println(result2)
-	fmt.Println(result3)
-	fmt.Println(result4)
-	fmt.Println(result5)
-	fmt.Println(result6)
+    fmt.Println(result1)
+    fmt.Println(result2)
+    fmt.Println(result3)
+    fmt.Println(result4)
+    fmt.Println(result5)
+    fmt.Println(result6)
 
-	// Output:
-	// 2
-	// 3
-	// 4
-	// 3
-	// 0
-	// 0
+    // Output:
+    // 2
+    // 3
+    // 4
+    // 3
+    // 0
+    // 0
 }
 ```
\ No newline at end of file