challenge_1.py

a = 3
b = 4
c = 5
if a % 2 == 0:
    print(f'{a} is even')
else:
    print(f'{a} is odd')
if b % 2 == 0:
    print(f'{b} is even')
else:
    print(f'{b} is odd')
if c % 2 == 0:
    print(f'{c} is even')
else:
    print(f'{c} is odd')

Let's assume we have some variables (a, b, and c) and we need to check if those are even numbers.
This is an example on how we may do it without using functions.
Refactor the above by using functions.