Add an if branch to complete double pennies()'s base case. Sample output for below program: Number of pennies after 10 days: 1024 Note: These activities may test code with different test values. This activity will perform four tests, with starting pennies = 1 and user_days = 10, then with starting_pennies = 1 and user_days = 40, then with starting_pennies = 1 and user_days = 1, then with starting_pennies = 1 and user_days = 0. See How to Use zyBooks. Also note: If the submitted code has an infinite loop, the system will stop running the code after a few seconds, and report "Program end never reached. The system doesn't print the test case that caused the reported message. 1 # Returns number of pennies if pennies are doubled num_days times 2 def double pennies (num_pennies, num_days): 3 total_pennies - 4 5* Your solution goes here * else: 6 7 8 9 total_pennies - double pennies ((num_pennies - 2), (num_days - 1)) 10 return total pennies 11 12 Program computes pennies if you have 1 penny today, 13 # 2 pennies after one day, 4 after two days, and so on 14 starting pennies 1 15 user_days 10 16 17 print('Number of pennies after', user_days, 'days: ", end-**) 18 print (double pennies (starting pennies, user_days))