a

Assets/Scripts/Inventory.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Inventory : MonoBehaviour
+{
+  [SerializeField] private int slots = 10;
+  [SerializeField] private int stackSize = 100;
+  [SerializeField] private List<Item> items = new List<Item>();
+
+
+  public Item Add(Item item)
+  {
+    foreach (Item i in items)
+    {
+      if (i.uuid == item.uuid) // item already is in list
+      {
+        if (i.quantity + item.quantity <= stackSize)
+        {// enough space
+          i.quantity += item.quantity;
+          item.quantity = 0;
+        }
+        else
+        {// Not enough space
+          i.quantity = stackSize;
+          item.quantity = Mathf.Max(0, i.quantity - item.quantity);
+        }
+      }
+    }
+    return item;
+
+  }
+
+}