How to make public the default folder in Codeigniter?

Question

CodeIgniter

How to make public the default folder in Codeigniter?
Here is the structure:
application
system
public
- assets
- upload
and to immediately specify /assets/.. or /upload/ and not /public/assets/... when connecting scripts, that is, so that the public folder is not even visible from the outside, this possibly? it's just that now by default it looks at the root folder of the CI itself with all php scripts, I think it's not very correct, thanks.
here htaccess still needs to be configured, I think