Can’t install ctorrent with brew

Please help me with this issue. I followed the instruction here to download ctorrent with:
brew install ctorrent

but it turned out errors like this:

Error: No available formula with the name "ctorrent"
==> Searching for a previously deleted formula (in the last month)...
Warning: homebrew/core is shallow clone. To get complete history run:
  git -C "$(brew --repo homebrew/core)" fetch --unshallow

Error: No previously deleted formula found.
==> Searching for similarly named formulae...
Error: No similarly named formulae found.
==> Searching taps...
==> Searching taps on GitHub...
Error: No formulae found in taps

I sought for the workaround but haven't found out yet. Below is my system information:

ProductName:    Mac OS X
ProductVersion: 10.13.6
BuildVersion:   17G10021
Homebrew 2.2.13