Decorator Implementation

Problem Statement

Implement a simple function decorator.

Background

Decorators wrap functions to add behavior:

@decorator
def func():
    pass
# Equivalent to: func = decorator(func)

Your Task

Write a decorator call_counter that counts how many times a function is called.

The decorated function should have an attribute call_count that tracks the count.

Output Format

The decorated function should work normally but have a call_count attribute.