public class CircularBuffer<T> {
    T[] buffer;
    int bufferSize;

    public CircularBuffer(int bufferSize) {
        this.bufferSize = bufferSize;
        buffer = new T[bufferSize];
    }

    public void Add(T item, int index) => buffer[index % bufferSize] = item;
    public T Get(int index) => buffer[index % bufferSize];
    public void Clear() => buffer = new T[bufferSize];
}