Update Shared Class Data from an Instance Method

You are to implement a simple counter class that keeps track of how many times any instance of the class has been incremented in total. The shared total must be a class attribute (shared among all instances). The instance method increment() should increase both the instance's own count and the shared class total. Additionally, implement a helper function make_and_increment(n_instances, increments_each) that: - Resets the shared class total to 0 (so each call reports only its own work), - Creates n_instances instances of the counter, - Calls increment() increments_each times on each instance, - Returns the class-level total after all increments. This exercise shows how instance methods can modify class-level data and how to ensure predictable, isolated results when running repeated scenarios.

Implement an instance method that updates a class attribute and write a helper function that uses the class to perform repeated increments while isolating each run.

Do not use any external libraries. The shared total must be stored as a class attribute. increment() must be an instance method that updates the class attribute. make_and_increment must reset the shared class total to 0 at the start of each call.