Refactor a Python program to improve its readability and maintainability.
The program is given below.

def main():
    result = []
    for item in range(10):
        if item % 3 == 0:
            result.append(item * item)
    return result
def main():
    result = [item * item for item in range(10) if item % 3 == 0]
    return result