New Shared Library

shared/Stack.go

@@ -0,0 +1,33 @@
+package shared
+
+type Stack struct {
+	head *Node
+}
+
+func (s *Stack) Push(item string) {
+	if s.head == nil {
+		s.head = &Node{
+			Value: item,
+			Next:  nil,
+		}
+	} else {
+		s.head = &Node{
+			Value: item,
+			Next:  s.head,
+		}
+	}
+}
+
+func (s *Stack) Pop() string {
+	node := s.Peek()
+	s.head = node.Next
+	return node.Value
+}
+
+func (s *Stack) Peek() (node *Node) {
+	node = s.head
+	if node == nil {
+		node = &Node{}
+	}
+	return
+}