[elisp] Look for function that create safe file name from string...

[Oleksandr Gavenko]

I decide store my message after sending it to mail/news.

As file name I use date and message header.

But message header may contain danger symbol. One of errors I get when '/'
char present in file name...

So I look for function that safely escape string to get file name in portable
for Emacs way...

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Best regards!