input: Write a python function to extract data from a POST request and save it to an SQLite database.
  assert save_form({'name': 'Alice', 'email': 'alice@example.com', 'phone': '123456789'}) == {'message': 'Successfully saved data'}
  assert save_form({'name': 'Bob', 'email': 'bob@example.com', 'phone': '987654321'}) == {'message': 'Successfully saved data'}
  assert save_form({'name': 'Charlie', 'email': 'charlie@example.com', 'phone': '555555555'}) == {'message': 'Successfully saved data'}
output: import sqlite3
  
  def save_form(data):
      conn = sqlite3.connect('form_data.db')
      cursor = conn.cursor()
      
      cursor.execute('''
      CREATE TABLE IF NOT EXISTS form_data (
          id INTEGER PRIMARY KEY AUTOINCREMENT,
          name TEXT NOT NULL,
          email TEXT NOT NULL,
          phone TEXT NOT NULL
      )
      ''')
      
      cursor.execute('''
      INSERT INTO form_data (name, email, phone) VALUES (?, ?, ?)
      ''', (data['name'], data['email'], data['phone']))
      
      conn.commit()
      conn.close()
      
      return {'message': 'Successfully saved data'}