Two level domain name pseudo static how to get (htaccess)

Two domains can be accessed normally (same IP, regular level two domain name)
Domain.com
Second.domain.com
Want to achieve is
SECOND.DOMAIN.COM/ABC Jump to Second.domain.com?c=abc

. htaccess is like this, and now everything is fine.

............. Rewriterule ^good$ test/good.php        //domain.com/good  normal access Rewritecond%{http_host} ^second.domain.com$ [NC] Rewriterule ^/(. *) $       /?c=$1//second.domain.com/abc    404

Console output SECOND.DOMAIN.COM/ABC 404 Not Found
Where is the reason? Look at the master answer

Reply to discussion (solution)

Re-build one under the ABC directory. htaccess
and then
Rewriterule ^/(. *) $/?c=$1

Oh, thank you so much.

