Revert "Aboid the error when specified the following path."

This reverts commit a3aad1f26ab61aa87a368869402b428e2458db80.
Avoid the error when specified the following path.

- On Windows
- Path is surronded by double quotation
- Last string of path is path separator

In this pattern(ex. pt word "dir\"), os.Args returns `dir"`.
So, unnecessary `"` must be deleted.