修复Md5的bug

string.go

@@ -9,6 +9,7 @@ package wrapper
 
 import (
 	"crypto/md5"
+	"encoding/hex"
 	"errors"
 	"git.zhangdeman.cn/zhangdeman/serialize"
 	"git.zhangdeman.cn/zhangdeman/util"
@@ -999,7 +1000,7 @@ func (str String) Md5() StringResult {
 		}
 	}
 	return StringResult{
-		Value: string(h.Sum(nil)),
+		Value: hex.EncodeToString(h.Sum(nil)),
 		Err:   nil,
 	}
 }