[stable-v2.0] fix build on gcc 13.x and some typo #69
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today while I was preparing a blksnap usage test on debian unstable the compilation was failed due to the error already reported in #65 so I did a quick search and made this fix which should solve the build issue with gcc 13 or higher
the PR include also commits of #66 because I keep for fast check it with circleci build on ubuntu 23.10
also fixed a typo on a test script extension and some typo spotted with codespell