my safari has a virus I want to delete it. how can I solve my problem?

As there a currently not viruses that affect Macs, no, you don't have a virus. Did you get a pop-up warning in Safari that told you that you did? If so, that's just an ad trying to scare you into downloading software you don't need.

Download and run the free version of Malwarebytes. It should take care of any adware you might have inadvertently installed.

https://www.malwarebytes.com/mwb-download/

And, to protect yourself going forward, read this:

Effective defenses against malware and ot… - Apple Community

What does it do on your Safari? Take a screenshot.