Brew cannot find any packages/Formula - here is a fix

I was trying to install many packages many times but always it was telling cannot find Similar formula. And searched through the web for a solution. Here is the only place I found a solution and..

       

 it WORKED! 

 I found this from stackoverflow. 

 brew doctor 

 git -C $(brew --repo homebrew/core) checkout master 

 https://stackoverflow.com/questions/63879627/brew-cannot-find-any-packages