INSTALLATION HELP

Hi! Im currently installing flutter on my pc. I'm pretty sure I am following the guide at youtube. But im stuck on the cmd part where I need to check if the flutter is installed.

  1. When i type flutter doctor in cmd, it automatically closes, I downloaded a new powershell and it says "Could not open input file /c"

I already extracted the downloaded file on c:/src/flutter/bin and pasted the path on the system environment variables and still the issue exists.

How do I fix this please?