Create a class called VendingMachine that represents a vending machine for some product. A VendingMachine object returns strings describing its interactions. See the doctest below for examples:

class VendingMachine: """A vending machine that vends some product for some price. >>> v = VendingMachine('candy', 10) >>> v.vend() 'Machine is out of stock.' >>> v.deposit(15) 'Machine is out of stock. Here is your $15.' >>> v.restock(2) 'Current candy stock: 2' >>> v.vend() 'You must deposit $10 more.' >>> v.deposit(7) 'Current balance: $7' >>> v.vend() 'You must deposit $3 more.' >>> v.deposit(5) 'Current balance: $12' >>> v.vend() 'Here is your candy and $2 change.' >>> v.deposit(10) 'Current balance: $10' >>> v.vend() 'Here is your candy.' >>> v.deposit(15) 'Machine is out of stock. Here is your $15.' >>> w = VendingMachine('soda', 2) >>> w.restock(3) 'Current soda stock: 3' >>> w.restock(3) 'Current soda stock: 6' >>> w.deposit(2) 'Current balance: $2' >>> w.vend() 'Here is your soda.' """ "*** YOUR CODE HERE ***"