fix(popup): use rstrip instead

Signed-off-by: Guennadi Maximov C <g.maxc.fox@protonmail.com>

Author: DrKJeff16

lua/project/popup.lua

@@ -136,17 +136,15 @@ local function open_node(proj, only_cd, ran_cd)
                 return item
             end
 
-            item = vim.fn.fnamemodify(item, ':p')
-            item = item:sub(-1, -1) == '/' and item:sub(1, item:len() - 1) or item
+            item = Util.rstrip('/', vim.fn.fnamemodify(item, ':p'))
             return vim.fn.isdirectory(item) == 1 and (item .. '/') or item
         end,
     }, function(item) ---@param item string
         if not item or in_list({ '', 'Exit' }, item) then
             return
         end
 
-        item = vim.fn.fnamemodify(item, ':p')
-        item = item:sub(-1, -1) == '/' and item:sub(1, item:len() - 1) or item
+        item = Util.rstrip('/', vim.fn.fnamemodify(item, ':p'))
         local stat = vim.uv.fs_stat(item)
         if not stat then
             return
@@ -230,14 +228,12 @@ function Popup.prompt_project(input)
         return
     end
 
-    input = vim.fn.fnamemodify(input, ':p')
-    input = input:sub(-1, -1) == '/' and (input:sub(1, input:len() - 1)) or input
+    input = Util.rstrip('/', vim.fn.fnamemodify(input, ':p'))
     if not (exists(input) and exists(vim.fn.fnamemodify(input, ':p:h'))) then
         error('Invalid path!', ERROR)
     end
     if not Util.dir_exists(input) then
-        input = vim.fn.fnamemodify(input, ':p:h')
-        input = input:sub(-1, -1) == '/' and (input:sub(1, input:len() - 1)) or input
+        input = Util.rstrip('/', vim.fn.fnamemodify(input, ':p:h'))
         if not Util.dir_exists(input) then
             error('Path is not a directory, and parent could not be retrieved!', ERROR)
         end