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3
IMO, it's easier to do simply:
inoremap <expr><CR> getline('.') =~# '^\s*//' ? '<C-O>o' : '<CR>'
Perhaps, this mapping (with <buffer> modifier, of course) should be added to after/ftplugin/c.vim and not to the global .vimrc
2
The idea of removing :// from 'comments' can be made to work, but instead of leaving Insert mode with <Esc>, use <C-\><C-O> to run a single Normal command (in this case, the : command to run the Ex :set command), returning to Insert mode as soon as that command is completed.
Using <C-\><C-O> here instead of <C-O> is ...
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