Given a string, return a new string where each character with an even index is uppercase, and each character with an odd index is lowercase.
For example:
upper_even_i("hello")→"HeLlO"upper_even_i("Darling")→"DaRlInG"upper_even_i("computer")→"CoMpUtEr"
Hint: The use of .upper() and .lower() functions might be needed.