samsonasik

RewriteCond %{HTTP_HOST} ^yourdomain.com$ [NC,OR]
RewriteCond %{REQUEST_URI} !yourapp/public
RewriteRule (.*) /yourapp/public/$1 [L]

place it at your public_html (shared hosting 'root' directory ).
if you call http://yourdomain.com so you will point out to public_html/yourapp/public/index.php