how to earn money from adsterra.

const express = require("express"); const shortid = require("shortid"); const app = express(); const database = {}; app.get("/", (req, res) => { res.send("Welcome to URL Shortener API"); }); app.get("/:url", (req, res) => { const longUrl = req.params.url; const shortUrl = shortid.generate(); database[shortUrl] = longUrl; res.send(`Short URL: localhost:3000/${shortUrl}`); }); app.get("/:shortUrl", (req, res) => { const shortUrl = req.params.shortUrl; const longUrl = database[shortUrl]; if (longUrl) { res.redirect(longUrl); } else { res.send("URL not found"); } }); app.listen(3000, () => { console.log("Server running on port 3000"); });