input: 
  from flask import Flask, render_template, request, redirect
  import sqlite3
  
  def submit_form_data(request) -> str:
      """
      This function processes the form submission and stores the data in a SQLite database.
      The form elements to be extracted from the request are: Name, Email, Phone.
      The function returns a redirect to the home page.
  
      >>> submit_form_data({ 'form': { 'name': 'John Doe', 'email': 'john@example.com', 'phone': '1234567890' } })
      '/'
      """
      name = request.form.get('name')
      email = request.form.get('email')
      phone = request.form.get('phone')
      
      conn = sqlite3.connect('data.db')
      cur = conn.cursor()
      
      cur.execute("INSERT INTO data (name, email, phone) VALUES (?, ?, ?)", (name, email, phone))
      conn.commit()
      
      return redirect('/')
  
output:     conn.close()