Function gen_zkapp_command_from 

pub fn gen_zkapp_command_from(params: GenZkappCommandParams<'_>) -> ZkAppCommand

gen_zkapp_command_from generates a zkapp_command and record the change of accounts accordingly in account_state_tbl. Note that account_state_tbl is optional. If it’s not provided then it would be computed from the ledger. If you plan to generate several zkapp_command, then please manually pass account_state_tbl to gen_zkapp_command_from function. If you are generating several zkapp_command, it’s better to pre-compute the account_state_tbl before you call this function. This way you can manually set the role of fee payer accounts to be Fee_payer in account_state_tbl which would prevent those accounts being used as ordinary participants in other zkapp_command.

Generated zkapp_command uses dummy signatures and dummy proofs.