Function create 

pub fn create<M, I, S>(
    abi: Abi,
    bytecode_str: &str,
    libs: I,
    client: Arc<M>,
) -> Result<ContractFactory<M>>
where
    M: Middleware,
    I: IntoIterator<Item = (S, Address)>,
    S: AsRef<str>,

Creates a contract factory with the given ABI and bytecode, linking the given libraries with their respective addresses.