Mr. _az
I think after I added some sentences in a-trst.ibcc.fun.conf, apache2 had stopped.
I might misunderstood, but adding the lines below, syntax error had started. now I deleted those lines and aoache2 have been running.
<VirtualHost *:80>
ServerName a-trust.ibcc.fun
DocumentRoot /var/www/html
RewriteEngine On
RewriteCond "%{REQUEST_URI}" "!^/\.well-known/acme-challenge/"
RewriteRule ^(.*)$ https://a-trust.ibcc.fun$1 [R]
</VirtualHost>