text: const express = require('express');
  const cryptoRouter = require('../crypto/crypto.router');
  const mathRouter = require('../math/math.router');
  const timeRouter = require('../time/time.router');
  const userRouter = require('../user/user.router');
  
  const app = express();
  app.use('/crypto', cryptoRouter);
  app.use('/math', mathRouter);
  app.use('/time', timeRouter);
  app.use('/user', userRouter);
  
  module.exports = app;
  