Implemented 2 classes

CoffeeVendingMachines/CoinDepot.cs

@@ -10,4 +10,36 @@ public class CoinDepot
         Coin = coin;
         Count = count;
     }
+    
+    public CoinDepot(CoinDepot coinDepot)
+    {
+        Coin = coinDepot.Coin;
+        Count = coinDepot.Count;
+    }
+
+    public void Add()
+    {
+        Count++;
+    }
+    
+    public void Clear()
+    {
+        Count = 0;
+    }
+
+    public override string ToString()
+    {
+        return $"{Coin}: {Count}";
+    }
+
+    public bool Withdraw()
+    {
+        if (Count > 0)
+        {
+            Count--;
+            return true;
+        }
+
+        return false;
+    }
 }

CoffeeVendingMachines/Model.cs

@@ -1,14 +1,11 @@
 namespace CoffeeVendingMachines;
 
-public class Model
+public enum CoinType
 {
-    public enum CoinType
-    {
-        Cent05,
-        Cent10,
-        Cent20,
-        Cent50,
-        Euro01,
-        Euro02
-    }
-}
+    Cent05,
+    Cent10,
+    Cent20,
+    Cent50,
+    Euro01,
+    Euro02
+}

CoffeeVendingMachines/Product.cs

@@ -2,5 +2,35 @@
 
 public class Product
 {
+    public const int FallbackPrice = 50;
+    private readonly int _price;
+    private int _stock;
+    public bool InStock => _stock > 0;
+    public string Name { get; }
+    public int NumberSold { get; private set; }
+    public int Price { get; private init; }
     
+    public Product (string name, int price = FallbackPrice, int stock = 0)
+    {
+        Name = name;
+        _price = price;
+        _stock = stock;
+    }
+
+    public bool AddSale()
+    {
+        if (InStock)
+        {
+            NumberSold++;
+            _stock--;
+            return true;
+        }
+
+        return false;
+    }
+
+    public override string ToString()
+    {
+        return $"{Name} € {Price} [{_stock} in stock | {NumberSold} sold]";
+    }
 }