fix: Use native shellescape to escape characters

Addresses issue #249. utils.escapeChars had been removed from the utils
module in commit 55c6244, but the
function was never replaced with shellescape in the moveSource function
in the paths module (big oops). Formatting to paths module also applied.

lua/mkdnflow/paths.lua

@@ -508,16 +508,13 @@ M.moveSource = function()
         vim.api.nvim_set_option('cmdheight', rows_needed)
         vim.ui.input({ prompt = prompt }, function(response)
             if response == 'y' then
-                if this_os:match('Windows') then
-                    os.execute('move "' .. derived_source .. '" "' .. derived_goal .. '"')
-                else
-                    os.execute(
-                        'mv '
-                            .. utils.escapeChars(derived_source)
-                            .. ' '
-                            .. utils.escapeChars(derived_goal)
-                    )
-                end
+                local command = string.format(
+                    '%s %s %s',
+                    this_os:match('Windows') and 'move' or 'mv',
+                    vim.fn.shellescape(derived_source),
+                    vim.fn.shellescape(derived_goal)
+                )
+                os.execute(command)
                 -- Change the link content
                 vim.api.nvim_buf_set_text(
                     0,
@@ -586,7 +583,12 @@ M.moveSource = function()
                 if goal_exists then -- If the goal location already exists, abort
                     vim.api.nvim_command('normal! :')
                     vim.api.nvim_echo(
-                        { { "⬇️  '" .. location .. "' already exists! Aborting.", 'WarningMsg' } },
+                        {
+                            {
+                                "⬇️  '" .. location .. "' already exists! Aborting.",
+                                'WarningMsg',
+                            },
+                        },
                         true,
                         {}
                     )
@@ -635,16 +637,12 @@ M.moveSource = function()
                 else -- Otherwise, the file we're trying to move must not exist
                     -- Clear the prompt & send a warning
                     vim.api.nvim_command('normal! :')
-                    vim.api.nvim_echo(
+                    vim.api.nvim_echo({
                         {
-                            {
-                                '⬇️  ' .. derived_source .. " doesn't seem to exist! Aborting.",
-                                'WarningMsg',
-                            },
+                            '⬇️  ' .. derived_source .. " doesn't seem to exist! Aborting.",
+                            'WarningMsg',
                         },
-                        true,
-                        {}
-                    )
+                    }, true, {})
                 end
             end
         end)