Sorry for other coin.
But where can I post about development/programming questions of other coin?
Probably in the altcoin sections (though those are a pool of endless trash and you'll end up with a trillion replies of how the project will save the world and investors need to invest)
Cloning ethereum is also possible?
Yes, it has been done before as well. You can fork ETH into your own coin.
With all its platform features like, possibility of put token above ethereum, smart contract above it, and what features have?
Yup, all of that is possible
All of that can be copied and anyone can launch new coin?
You can do all that but if you're just forking vanilla ETH and making no changes only an absolute idiot would switch over from ETH to your platform