Using Python.

Define a function make_counter that returns a counter function, which takes a string and returns the number of times that the function has been called on that string.

def make_counter():

"""Return a counter function.

>>> c = make_counter()

>>> c('a')

1

>>> c('a')

2

>>> c('b')

1

>>> c('a')

3

>>> c2 = make_counter()

>>> c2('b')

1

>>> c2('b')

2

>>> c('b') + c2('b')

5

"""

"*** YOUR CODE HERE ***"