input: Write a function to create a basic CRUD API for the BlogPost model using Python/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_api()==None
  assert get_posts()==[]
  assert create_post({'title':'First Post', 'content':'This is the first post'})==1
  assert get_post(1)=={'id':1, 'title':'First Post', 'content':'This is the first post'}
  assert edit_post(1, {'title':'Updated Post', 'content':'This is the updated content'})=={'id':1, 'title':'Updated Post', 'content':'This is the updated content'}
  assert delete_post(1)=={'message': 'Post deleted'}
  assert get_posts()==[]
output: posts = []
  post_id_counter = 1
  
  def create_api():
      pass
  
  def get_posts():
      return posts
  
  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_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'}