Write a function generateLogin(first, last, zipc) that generates and returns a login name for a user given their firstname, lastname, and zipcode such that it has every other character of their first, last, and zipcode in the respective order and returns this login name all in uppercase. See the following example:
Input
- Firstname: Olivia
- Lastname: Smith
- Zipcode: 10010
Output Generated login: OIISIH100
