HTTP + HTTPS + www + non-www Apache config - apache

Question

In my Apache configuration, everything is redirected to HTTPS (which is good). But both https://www.example.com and https://example.com still exist.
Question: how to have only https://www.example.com and not the non-www?
Should I use a 301 Redirection or another technique?
How should such a configuration be changed:
<VirtualHost *:80>
ServerName example.com
ServerAlias *.example.com
RewriteEngine on
RewriteCond %{HTTPS} !on
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
</VirtualHost>
<IfModule mod_ssl.c>
<VirtualHost *:443>
ServerName example.com
ServerAlias *.example.com
DocumentRoot /home/www/example
<Directory />
Options FollowSymLinks
AllowOverride All
Order deny,allow
Allow from all
Require all granted
</Directory>
SSLCertificateFile /etc/letsencrypt/live/example.com/cert.pem
SSLCertificateKeyFile /etc/letsencrypt/live/example.com/privkey.pem
Include /etc/letsencrypt/options-ssl-apache.conf
SSLCertificateChainFile /etc/letsencrypt/live/example.com/chain.pem
</VirtualHost>
</IfModule>
?

Answer 1

Relymcd's answer solved the problem, but it also needs the certificate lines to be present (if not it will fail):
<VirtualHost *:443>
ServerName example.com
Redirect 301 / https://www.example.com/
SSLCertificateFile /etc/letsencrypt/live/example.com/cert.pem
SSLCertificateKeyFile /etc/letsencrypt/live/example.com/privkey.pem
Include /etc/letsencrypt/options-ssl-apache.conf
SSLCertificateChainFile /etc/letsencrypt/live/example.com/chain.pem
</VirtualHost>

Answer 2

One way to do it is to change the current virtual host ServerName www.example.com and add a new Virtual Host for the non-www
<VirtualHost *:443>
ServerName example.com
Redirect 301 / https://www.example.com/
</VirtualHost>