Once my friend help me to solve this issue, I have written code like that. Where example.com/blog-detail?slug=slugvalue it goes to blog-detail.php and this url example.com/project?slug=test goes to project.php.
RewriteEngine ON
##Checking condition and getting matches in variables to be used while redirect in next rule.
RewriteCond %{THE_REQUEST} \s([^?]*)\?slug=(\S+)\s [NC]
RewriteRule ^ %1/%2? [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(?:[^/]*)/(.*)/?$ blog-detail.php?slug=$1 [QSA,L]
I think it's work for only blog-detail page now i face the issue with this url https://www.example.com/project?slug=test, it redirect me to 404 page, could you help me here.