Create Setup in such a way so that System A can ping to B and C but both should not be pinging each other(Don't use firewall)

I have Solved this problem Statement and also written an blog on it ... Hope You All Enjoy it .

Blog Link :- https://shashwatsingh71.medium.com/create-a-network-topology-setup-in-such-a-way-so-that-system-a-can-ping-to-two-systems-system-b-b9b73765ad07