input: 
  def submit_form():
      """ Create an application using Python and Flask to submit form data and store it in a database.
      The form contains three elements: Name, Email, and Phone. After submitting the form, the data
      should be inserted into a SQLite database named 'data.db'. The application should redirect to
      the home page after submission.
      >>> 
      """
  
output:     
      from flask import Flask, request, redirect, url_for
      import sqlite3
  
      app = Flask(__name__)
  
      @app.route('/')
      def home():
          return '''
          <form action="/submit" method="post">
              <label for="name">Name:</label>
              <input type="text" id="name" name="name"><br><br>
              <label for="email">Email:</label>
              <input type="email" id="email" name="email"><br><br>
              <label for="phone">Phone:</label>
              <input type="tel" id="phone" name="phone"><br><br>
              <input type="submit" value="Submit">
          </form>
          '''
  
      @app.route('/submit', methods=['POST'])
      def submit():
          name = request.form['name']
          email = request.form['email']
          phone = request.form['phone']
  
          conn = sqlite3.connect('data.db')
          cursor = conn.cursor()
          cursor.execute('''
              CREATE TABLE IF NOT EXISTS users (
                  id INTEGER PRIMARY KEY AUTOINCREMENT,
                  name TEXT NOT NULL,
                  email TEXT NOT NULL,
                  phone TEXT NOT NULL
              )
          ''')
          cursor.execute('INSERT INTO users (name, email, phone) VALUES (?, ?, ?)', (name, email, phone))
          conn.commit()
          conn.close()
  
          return redirect(url_for('home'))
  
      if __name__ == '__main__':
          app.run(debug=True)
  