Where is the source code for the business logic calcuations such as incrementing the number of shares?

I am interested to know where the Tokenized Smart Contract does its contract business logic calculations such as for updating various sums.

I am not sure what exactly you mean by “business logic”, but the token balances are managed here.

And the total shares/tokens can be modify with asset amendments here.

Oh the “Financial Logic” is in AddDebit() and AddDeposit() defined in https://github.com/tokenized/smart-contract/blob/master/internal/holdings/holdings.go Thanks.