fix: close dir

[testwill]

close dir int the mkDstDir function

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[koba1t]

Hi @testwill
Please write test cases if you fixed something.
And, Please write what you want to do for the PR title and messages.

[stormqueen1990]

Hi there, @testwill!

Could you please also add a test to cover the failure scenario (when the folder already exists), as @koba1t requested in a previous review?

Thanks in advance!

[stormqueen1990]

It looks like the only purpose for this os.Open() call is to check whether the folder already exists. Since this is the case, I believe it would be better to use os.Stat() here instead of os.Open().