public class CompositeStrategy : IStrategy
{
    private readonly IEnumerable<IStrategy> _strategies;

    public CompositeStrategy(IEnumerable<IStrategy> strategies)
        => _strategies = strategies;

    public State GetNewState(State state, UserInput userInput)
        => _strategies.Aggregate(
            state,
            (acc, strategy) => strategy.GetNewState(acc, userInput));
}