text: from flask import Blueprint
  
  router = Blueprint("router", __name__)
  
  @router.route("/check")
  def check():
      return "Congratulations! Your app works. :)"
  
  @router.route("/hello")
  def hello():
      return "Hacktoberfest is cool!"
  
  @router.route("/add", methods=["POST"])
  def add():
      # Add logic here
      return
  