Shop C# and coin safe like a money

i don't know how to make my hero to can go through coins and how to mark it like a money i made script and i had a coin but i can't get it and also i don't know how to make powerup upgrade i mean how to increase powerup duration like an upgrade exemple:powerup +10 health duration:10 sec after buy the increase powerup duration upgrade to be something like that powerup +10 health duration:15sec i already have a powerup and all is okey i need help only for the upgrade here some of my scripts using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI; using UnityEngine.SceneManagement;

 public class GameControl : MonoBehaviour {
 
     public Text moneyText;
     public static int moneyAmount;
     int isPowerupSold;
     public GameObject powerup;
 
 
     void Start () {
         moneyAmount = PlayerPrefs.GetInt("MoneyAmount");
         isPowerupSold = PlayerPrefs.GetInt("isPowerupSold");
 
         if (isPowerupSold == 1)
             powerup.SetActive(true);
         else
             powerup.SetActive(false);
 
     }
     
     void Update () {
         moneyText.text = "Money: " + moneyAmount.ToString() + "$";
     }
 
     public void LoadShope()
     {
         Time.timeScale = 1f;
         PlayerPrefs.SetInt("MoneyAmount", moneyAmount);
         SceneManager.LoadScene("Shop");
     }
 
 }
 

///////////////////////////////////////// ,`using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI; using UnityEngine.SceneManagement;

 public class ShopControl : MonoBehaviour
 {
 
     int moneyAmount;
     int isPowerupSold;
 
     public Text moneyAmountText;
     public Text powerupPrice;
 
     public Button buyButton;
 
     // Use this for initialization
     void Start()
     {
         moneyAmount = PlayerPrefs.GetInt("MoneyAmount");
     }
 
     // Update is called once per frame
     void Update()
     {
 
         moneyAmountText.text = "Money: " + moneyAmount.ToString() + "$";
 
         isPowerupSold = PlayerPrefs.GetInt("IsPowerupSold");
 
         if (moneyAmount >= 1000 && isPowerupSold == 0)
             buyButton.interactable = true;
         else
             buyButton.interactable = false;
     }
 
     public void buyPowerUP()
     {
         moneyAmount -= 1000;
         PlayerPrefs.SetInt("IsPowerupSold", 1);
         powerupPrice.text = "Sold!";
         buyButton.gameObject.SetActive(false);
     }
 
     public void exitShop()
     {
         PlayerPrefs.SetInt("MoneyAmount", moneyAmount);
         SceneManager.LoadScene("Menu");
     }
 
     public void resetPlayerPrefs()
     {
         moneyAmount = 0;
         buyButton.gameObject.SetActive(true);
         powerupPrice.text = "Price: 1000$";
         PlayerPrefs.DeleteAll();
     }
 
 }`

and for the coin too

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Coin : MonoBehaviour {
 
     private void OnTriggerEnter(Collider other)
     {
         if (other.CompareTag("Player"))
             GameControl.moneyAmount += 1;
         Destroy(gameObject);
     }
 }