* collect rent from credit-debit account
* collect rent from credit only account
* improved design for rent collection
* only process if collected rent is non zero
* rent_collector now can deduct partial rent + no mem copy
* adding a test to test credit only rent
* add bank level test for rent deduction
* add test to check if hash value changes or not
* adding test scenario for lamport circulation
* combining rent debtors into credit only locks
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