Decorators — Call Counter

Implement solve(calls) that:
1. Defines a count_calls decorator that tracks how many times the wrapped function has been called via a call_count attribute on the wrapper.
2. Applies the decorator to a dummy function.
3. Calls that function calls times.
4. Returns call_count.

solve(3)   # → 3
solve(0)   # → 0
solve(10)  # → 10

Constraints

• call_count must start at 0 before the first call.
• The wrapper must accept any positional and keyword arguments (*args, **kwargs).