rabidus-test/Assets/PlayerInputHandler.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;

public class PlayerInputHandler : MonoBehaviour
{
    [SerializeField] private PlayerInputReference _playerInput;
    [SerializeField] private List<PlayerInputReference> _inputs = new List<PlayerInputReference>();

    public bool Boost => _inputs.Any(i => i.Boost());
    public float Horizontal => _inputs.Select(i=>i.Horizontal()).Sum();

    private void Awake()
    {
        Init();
    }

    private void Init()
    {
        foreach (var input in _inputs)
            input.Init();
    }
}