Brew install * failed, solution

today mac perform brew install realpath when , There's a mistake

Warning: No available formula with the name "realpath".
==> Searching for similarly named formulae...
Error: No similarly named formulae found.
==> Searching for a previously deleted formula (in the last month)...
Error: No previously deleted formula found.
==> Searching taps on GitHub...
Error: No formulae found in taps.

resolvent ：

rm -rf /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core
brew update

And need to go back ～ Under the table of contents , Otherwise, you will still be prompted that the installation failed .
Then execute the command again ：brew install realpath