use fnamemodify to get parent path instead of writing our own function

lua/dap-go.lua

@@ -62,25 +62,6 @@ local function filtered_pick_process()
   return require("dap.utils").pick_process(opts)
 end
 
-local get_parent = (function()
-  local sep = "\\"
-
-  local os = string.lower(jit.os)
-  if os ~= "windows" then
-    sep = "/"
-  end
-
-  local pattern = string.format("^(.+)%s[^%s]+", sep, sep)
-
-  return function(abs_path)
-    local parent = abs_path:match(pattern)
-    if parent ~= nil and not parent:find(sep) then
-      return parent .. sep
-    end
-    return parent
-  end
-end)()
-
 local function setup_delve_adapter(dap, config)
   local args = { "dap", "-l", "127.0.0.1:" .. config.delve.port }
   vim.list_extend(args, config.delve.args)
@@ -109,8 +90,8 @@ local function setup_delve_adapter(dap, config)
         local is_dir = vim.loop.fs_stat(program_absolute).type == "directory"
         if is_dir then
           delve_config.executable.cwd = program_absolute
-        elseif program_absolute:sub(-3) == ".go" then -- file extension is '.go'
-          local parent = get_parent(program_absolute)
+        elseif vim.fn.fnamemodify(program_absolute, ":e") == ".go" then -- file extension is '.go'
+          local parent = vim.fn.fnamemodify(program_absolute, ":p:h")
           if parent ~= nil then
             delve_config.executable.cwd = parent
           end