[Fix] Fixed left to right (#11)

Fixed reversed selections not only working from bottom to top

lua/codesnap/utils/visual.lua

@@ -4,18 +4,17 @@ function visual_utils.get_selected_text()
   local start_pos = vim.fn.getpos("v")
   local end_pos = vim.fn.getpos(".")
 
+  -- We switch the start and end positions if the start is after the end line or character
+  -- This way we can always select from the top down and from left to right
+  if start_pos[2] > end_pos[2] or start_pos[3] > end_pos[3] then
+    start_pos, end_pos = end_pos, start_pos
+  end
+  
   if start_pos[2] == end_pos[2] then
     return vim.api.nvim_buf_get_lines(0, start_pos[2] - 1, start_pos[2], false)[1]:sub(start_pos[3], end_pos[3] - 1)
   else
     -- 如果选中的是多行文本，则需要分别获取每一行的文本
-    local selected_text = {}
-
-    -- We switch the start and end positions if the start position is after the end position
-    -- This way we can always select from the top down
-    if start_pos[2] > end_pos[2] then
-      start_pos, end_pos = end_pos, start_pos
-    end
-    
+    local selected_text = {}    
     for i = start_pos[2], end_pos[2] do
       -- 使用 vim.api.nvim_buf_get_lines() 函数获取选中的文本
       local line_text = vim.api.nvim_buf_get_lines(0, i - 1, i, false)[1]