Are there any command-line tools to merge two srt files?

I have two srt files, cd1.srt and cd2.srt. Unfortunately, srtool is no longer available anywhere which was the answer to the same question when it was asked a few years ago. https://unix.stackexchange.com/questions/2283/how-do-i-merge-two-srt-files/606947#606947 but came up short. I tried https://tracker.debian.org/pkg/pysrt , it does everything except join srt files :( I even looked up github but found entries only such as these - https://github.com/malfroid/merge-srt-subtitles If anybody knows a better way please share. I also looked at a few online solutions as well but sadly all of them did not work out :(