Added Push, Pop and Peek methods to Stack

C#/Datastructures/Stack.cs

@@ -4,7 +4,7 @@ namespace C_.Datastructures
 {
     internal class Stack<T>
     {
-        public StackNode<T>? Head { get; set; }
+        internal StackNode<T>? Head { get; set; }
         private int Count { get; set; } = 0;
 
         public Stack<T> Create(){
@@ -19,5 +19,34 @@ namespace C_.Datastructures
                 Count = 1
             };
         }
+
+        public void Push(T value){
+            //Add an Item to the end of the list
+            if (Count > 0)
+            {    
+                Count++;
+                Head = StackNode<T>.Create(value, Head);
+                return;
+            }
+        }
+
+        public T? Pop(){
+            T? value = default;
+            if (Count > 0)
+            {//Assign the default value if there are any items left in the stack
+                Count--;
+                value = Head!.Value;
+                Head = Head.Next;
+            }
+            return value;
+        }
+
+        public T? Peek(){
+            if (Count > 0)
+            {
+                return Head!.Value;
+            }
+            return default;
+        }
     }
 }