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https://www.siteground.com/kb/how_to_change_my_document_root_folder_using_an_htaccess_file/

#OPTION #1
RewriteEngine on
RewriteRule ^(.*) public/$1 [L]


OPTION #2 , for Laravel
RewriteEngine on
RewriteCond %{HTTP_HOST} ^domain-name.com$ [NC,OR]
RewriteCond %{HTTP_HOST} ^www.domain-name.com$
RewriteCond %{REQUEST_URI} !public/
RewriteRule (.*) /public/$1 [L]