7.12. strings are mutable

You can change the letters in an string one at a time using the [] operator on the left side of an assignment.

The active code below changes the first letter in greeting to be 'J'.

This produces the output Jello, world!.

Put together the code below to create a function mixer that takes in two strings and replaces every even index of the first string by the corresponding index of the second. It returns the modified first string. Example: string_a = "food" and string_b = "summer" . mixer(string_a ,string_b ) makes string_a become “somd”.

Assume second string is greater than first.

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