diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5c19cc1
--- /dev/null
+++ b/README.md
@@ -0,0 +1,56 @@
+<!--
+ * @Date: 2021-03-21 19:54:57
+ * @LastEditors: viletyy
+ * @LastEditTime: 2021-06-10 14:29:28
+ * @FilePath: /yolk/README.md
+-->
+# Yolk
+
+[![viletyy yolk](https://img.shields.io/badge/readme%20style-standard-brightgreen.svg?style=flat-square)](https://github.com/viletyy/yolk)
+
+Go项目公共包
+
+在开发项目中，经常使用的方法。
+
+本公共包包含以下内容：
+
+1. 数据类型转换。
+2. 常用加解密算法。
+3. 文件夹辅助方法。
+4. 分页。
+5. 随机字符串。
+
+## 内容列表
+
+- [Yolk](#yolk)
+  - [内容列表](#内容列表)
+  - [安装](#安装)
+  - [使用说明](#使用说明)
+  - [如何贡献](#如何贡献)
+  - [使用许可](#使用许可)
+
+## 安装
+
+这个项目使用 [go](https://golang.org/) 。请确保你本地安装了它。
+
+```sh
+$ tar -C /usr/local -xzf go1.4.linux-amd64.tar.gz
+$ export PATH=$PATH:/usr/local/go/bin
+```
+
+## 使用说明
+
+```sh
+$ go get -u github.com/viletyy/yolk
+$ go mod tidy
+$ go mod vendor
+```
+
+## 如何贡献
+
+非常欢迎你的加入！[提一个 Issue](https://github.com/viletyy/yolk/issues/new) 或者提交一个 Pull Request。
+
+
+## 使用许可
+
+[MIT](LICENSE) © Viletyy
diff --git a/helper.go b/convert/convert.go
similarity index 90%
rename from helper.go
rename to convert/convert.go
index ebde5c8..a0e6a08 100644
--- a/helper.go
+++ b/convert/convert.go
@@ -1,28 +1,17 @@
 /*
- * @Date: 2021-03-12 17:37:03
+ * @Date: 2021-06-10 14:20:53
  * @LastEditors: viletyy
- * @LastEditTime: 2021-04-27 16:05:14
- * @FilePath: /yolk/helper.go
+ * @LastEditTime: 2021-06-10 14:21:09
+ * @FilePath: /yolk/convert/str_to.go
  */
-package yolk
+package convert
 
 import (
 	"fmt"
-	"math/rand"
 	"reflect"
 	"strconv"
 )
 
-func GetRandomString(n int) string {
-	const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
-	var bytes = make([]byte, n)
-	rand.Read(bytes)
-	for i, b := range bytes {
-		bytes[i] = alphanum[b%byte(len(alphanum))]
-	}
-	return string(bytes)
-}
-
 type StrTo string
 
 func (f *StrTo) Set(v string) {
diff --git a/directory.go b/directory/directory.go
similarity index 84%
rename from directory.go
rename to directory/directory.go
index 5592cf6..c1b6b58 100644
--- a/directory.go
+++ b/directory/directory.go
@@ -1,10 +1,10 @@
 /*
  * @Date: 2021-03-22 10:45:37
  * @LastEditors: viletyy
- * @LastEditTime: 2021-04-29 11:44:54
- * @FilePath: /yolk/directory.go
+ * @LastEditTime: 2021-06-10 14:25:28
+ * @FilePath: /yolk/directory/directory.go
  */
-package yolk
+package directory
 
 import (
 	"fmt"
@@ -24,7 +24,7 @@ func PathExists(path string) (bool, error) {
 
 func IsDir(f string) bool {
 	fi, err := os.Stat(f)
-	if err  != nil {
+	if err != nil {
 		return false
 	}
 	return fi.IsDir()
diff --git a/paginator.go b/paginator/paginator.go
similarity index 94%
rename from paginator.go
rename to paginator/paginator.go
index 3ce1c14..f24bf1d 100644
--- a/paginator.go
+++ b/paginator/paginator.go
@@ -1,16 +1,18 @@
 /*
  * @Date: 2021-04-27 13:50:37
  * @LastEditors: viletyy
- * @LastEditTime: 2021-04-27 14:31:42
- * @FilePath: /yolk/paginator.go
+ * @LastEditTime: 2021-06-10 14:23:35
+ * @FilePath: /yolk/paginator/paginator.go
  */
-package yolk
+package paginator
 
 import (
 	"math"
 	"net/http"
 	"net/url"
 	"strconv"
+
+	"github.com/viletyy/yolk/convert"
 )
 
 type Paginator struct {
@@ -40,7 +42,7 @@ func (p *Paginator) Nums() int64 {
 }
 
 func (p *Paginator) SetNums(nums interface{}) {
-	p.nums, _ = ToInt64(nums)
+	p.nums, _ = convert.ToInt64(nums)
 }
 
 func (p *Paginator) Page() int {
diff --git a/random/random.go b/random/random.go
new file mode 100644
index 0000000..9e9578d
--- /dev/null
+++ b/random/random.go
@@ -0,0 +1,19 @@
+/*
+ * @Date: 2021-06-10 14:24:22
+ * @LastEditors: viletyy
+ * @LastEditTime: 2021-06-10 14:24:36
+ * @FilePath: /yolk/random/random.go
+ */
+package random
+
+import "crypto/rand"
+
+func RandomString(n int) string {
+	const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+	var bytes = make([]byte, n)
+	rand.Read(bytes)
+	for i, b := range bytes {
+		bytes[i] = alphanum[b%byte(len(alphanum))]
+	}
+	return string(bytes)
+}