You can not clone bitcoin because there is nothing there to copy, bitcoin are result of caculation on the blockchain data, to clone bitcoin you have to alter the blockchain data, and blockchain is designed in such a way that since data is stored and secured they can not be altered this is common misconception.
It cant be clone but it can be forked or created something almost the same with bitcoin. Many users or developers have tried to recreate bitcoin with a different name but has the same purpose but since bitcoin is the first its literally hard to clone.