input: 
  from typing import List, Any
  
  def crud_operations(operations: List[str], names: List[str]) -> List[Any]:
      """Perform CRUD operations on a in-memory SQLite database. Given a list of operations 
      ["create", "read", "update", "delete"] and a corresponding list of names, the function 
      should return the result of the operations. Specifically:
      - "create" adds a name to the database.
      - "read" returns all names in the database.
      - "update" updates a name in the database (if the name exists, it updates to itself; 
        if it doesn't exist, it does nothing).
      - "delete" removes a name from the database if it exists.
      
      >>> crud_operations(["create", "read", "delete", "read"], ["Alice"])
      [None, [('Alice',)], None, []]
      """
      results = []
      model = Model()
      
      for operation, name in zip(operations, names):
          if operation == "create":
              results.append(model.create(name))
          elif operation == "read":
              results.append(model.read())
          elif operation == "update":
              results.append(model.update(name))
          elif operation == "delete":
              results.append(model.delete(name))
      
      return results
  
output:     
      class Model:
          def __init__(self):
              self.db = []
          
          def create(self, name):
              self.db.append(name)
              return None
          
          def read(self):
              return [(name,) for name in self.db]
          
          def update(self, name):
              if name in self.db:
                  return None
              return None
          
          def delete(self, name):
              if name in self.db:
                  self.db.remove(name)
              return None
  