Function btck_transaction_input_get_out_point 

pub unsafe extern "C" fn btck_transaction_input_get_out_point(
    transaction_input: *const btck_TransactionInput,
) -> *const btck_TransactionOutPoint

@brief Get the transaction out point. The returned transaction out point is not owned and depends on the lifetime of the transaction.

@param[in] transaction_input Non-null. @return The transaction out point.