Tear down everything

Fix config

internal/common/stack.go

@@ -0,0 +1,47 @@
+package common
+
+import (
+	"errors"
+	"sync"
+)
+
+type Stack[T any] struct {
+	items []T
+	mutex sync.Mutex
+}
+
+func NewStack[T any]() *Stack[T] {
+	return &Stack[T]{
+		items: make([]T, 0),
+		mutex: sync.Mutex{},
+	}
+}
+
+func (s *Stack[T]) Push(item T) {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+
+	s.items = append(s.items, item)
+}
+
+func (s *Stack[T]) Pop() (T, error) {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+
+	if len(s.items) == 0 {
+		var empty T
+		return empty, errors.New("stack is empty")
+	}
+
+	item := s.items[len(s.items)-1]
+	s.items = s.items[:len(s.items)-1]
+
+	return item, nil
+}
+
+func (s *Stack[T]) IsEmpty() bool {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+
+	return len(s.items) == 0
+}