Changing my hosts file is not working

I'm trying to redirect bing.com to google.com, so when I enter bing.com on my browser address I should be redirected to google.com instead but it's just not working...

I opened the hosts file using notepad as an administrator, and change it to

172.217.25.110 bing.com # should redirect to google but not!

I'm trying to learn something and this is a part of the tutorial that I'm reading on, this is just an excerpt that is somehow related to Codeigniter.