Clearcast macro request

Hello, I am new here and I am looking for a (I believe) rather simple macro.
I do not want to use any addon for it (if that is possible) and some people told me it was impossible to do even though others told me it wasn’t.
As a feral druid I’d like to have a macro that makes me cast Brutal Slash at all times but whenever my clearcast procs it should switch to casting Shred until my clearcast is used. Is that possible?

No, as far as I know (someone could correct me), conditionals on macros such as IF (x) spell active THEN is not wanted by Blizzard in game.

No, as far as I know (someone could correct me), conditionals on macros such as IF (x) spell active THEN is not wanted by Blizzard in game.

Correct