input: Write a function to create a basic CRUD API for the BlogPost model using Python and Flask. The API should include endpoints for creating a post, getting all posts, getting a single post, editing a post, and deleting a post.
  assert create_post({"title": "First Post", "content": "This is the first post."})==1
  assert get_posts()==[{"id": 1, "title": "First Post", "content": "This is the first post."}]
  assert get_post(1)=={"id": 1, "title": "First Post", "content": "This is the first post."}
  assert edit_post(1, {"title": "Updated Post", "content": "This post has been updated."})=={"id": 1, "title": "Updated Post", "content": "This post has been updated."}
  assert delete_post(1)=={"message": "Post deleted"}
  assert get_posts()==[]
output: posts = []
  post_id_counter = 1
  
  def create_post(post_data):
      global post_id_counter
      post = {"id": post_id_counter, "title": post_data["title"], "content": post_data["content"]}
      posts.append(post)
      post_id_counter += 1
      return post["id"]
  
  def get_posts():
      return posts
  
  def get_post(post_id):
      for post in posts:
          if post["id"] == post_id:
              return post
      return None
  
  def edit_post(post_id, updated_data):
      for post in posts:
          if post["id"] == post_id:
              post["title"] = updated_data["title"]
              post["content"] = updated_data["content"]
              return post
      return None
  
  def delete_post(post_id):
      global posts
      posts = [post for post in posts if post["id"] != post_id]
      return {"message": "Post deleted"}