Fix not overwriting files/dirs when trying to create a dir

[SpyrosRoum]

Closes #136 hopefully for good

[marcospb19]

Brilliant! Will just be addressing your ToDo comment:

[sigmaSd]

This line https://github.com/ouch-org/ouch/pull/190/files#diff-b86d43fce6a9c57160aa925719550d40a6ed3f5e5a0117679905f76e68acc520R345 removes the current directory if the user doesn't use the --dir flag (because outputdir = ".")

and the message isn't obvious either Do you want to overwrite ''? [Y/n]

[marcospb19]

If you turn strip_cur_dir into this:

pub fn strip_cur_dir(source_path: &Path) -> &Path {
    source_path
}

So it does not affect the code anymore, then.

Do you want to overwrite ''? [Y/n]

Turns into

Do you want to overwrite '.'? [Y/n]

Which proves the point that, indeed, it's trying to overwrite the current directory, I ran into this earlier today (at 3 AM).

[sigmaSd]

Personally I prefer if in that message the path was canonicalized, was this discussed before?

[marcospb19]

Kinda, canonicalize paths are something I was with intent of fixing it myself, but I'd prefer 'current directory' instead of the full path, but... this should never appear in this error message anyways.

I think that this

Do you want to overwrite 'LICENSE'? [Y/n]

Is better than

Do you want to overwrite '/home/sigmaSd/ouch/LICENSE'? [Y/n]