Algorithm for dispensing banknotes from an ATM

Given an object denominations, where keys represent banknote denominations and values are their available quantities. It is required to implement a function atmWithdraw(amount, denominations), which takes the target amount to dispense (amount) and an object with current banknote counts (denominations). The function should return a new object containing the set of banknotes needed to dispense the specified amount, in the same format as denominations. The original denominations object should be modified: the number of used banknotes should decrease. If it is impossible to assemble the required amount from the available banknotes, then:

• the denominations object remains unchanged;
• the function returns a string message indicating the impossibility of the withdrawal.