Initially, the banking system does not contain any accounts, so Implement operations to allow account creation, deposits, and transfers between $2$ different accounts.

README

create account$($self$,$ timestamp: int, account id: str$)->$ bool should create a new account with the given identiler if it doesn't already exist, Returns true if the account was successfully created or False if an account with account id already exists.

deposit $($self$,$ timestamp: int, account id: str$,$ amount: int$)$ int $|$ None should deposit the given amount of money to the specified account account id$.$ Returns the balance of

the account after the operation has been processed. If the specified account doesn't exist, should return None

SETTINGS

transfer$($self$,$ timestamp: int, source account$\_$id: str$,$ target account id: str$.$ amount: int$)$ int $|$ None should transfer the given amount of money from account source account id to account target account id$.$ Returns the balance of source account id if the transfer was successful of None otherwise.

Returns None if source account id of target account$\_$id doesn't exist.

Returns None if source account id and target account id are the same.

Retums None if account source account id has insufficient funds to perform the transfer.