diff --git a/lua/Trans/backend/offline.lua b/lua/Trans/backend/offline.lua
index 330b704..bf9a532 100644
--- a/lua/Trans/backend/offline.lua
+++ b/lua/Trans/backend/offline.lua
@@ -29,9 +29,24 @@ M.query = function(opts)
             limit = 1,
         })[1]
 
-    return res and formatter(res) or nil
+
+    local ret = {
+        -- from = '',
+        -- to = '',
+        engine = 'offline',
+    }
+
+    if res then
+        res.result = formatter(res)
+        -- TODO 
+    else
+        -- TODO :
+    end
+
+    return ret
 end
 
+
 M.nowait = true
 
 M.field = {
diff --git a/lua/Trans/backend/util.lua b/lua/Trans/backend/util.lua
index 1c9b7e1..ef03e2f 100644
--- a/lua/Trans/backend/util.lua
+++ b/lua/Trans/backend/util.lua
@@ -11,6 +11,4 @@ M.is_English = function(str)
 end
 
 
-
 return M
-
diff --git a/lua/Trans/wrapper/buffer.lua b/lua/Trans/wrapper/buffer.lua
index 698f8dc..1c331e0 100644
--- a/lua/Trans/wrapper/buffer.lua
+++ b/lua/Trans/wrapper/buffer.lua
@@ -1,10 +1,10 @@
-local api, fn = vim.api, vim.fn
-
 ---@class buf
 ---@field bufnr integer buffer handle
 ---@field size integer buffer line count
 local buffer = {}
 
+local api, fn = vim.api, vim.fn
+
 ---Clear all content in buffer
 function buffer:wipe()
     api.nvim_buf_set_lines(self.bufnr, 0, -1, false, {})