Competitive web page loader

It is necessary to improve the program so that:

• it does not use time.Sleep to wait for goroutines to finish;
• errors that occur are handled correctly;
• it waits for all requests to complete.

package main

import (
    "fmt"
    "net/http"
    "sync"
)

func main() {
    urls := []string{
        "https://www.lamoda.ru",
        "https://www.yandex.ru",
        "https://www.mail.ru",
        "https://www.google.com",
    }

    var wg sync.WaitGroup

    for _, url := range urls {
        wg.Add(1)
        go func(url string) {
            defer wg.Done()
            fmt.Printf("Fetching %s...\n", url)

            err := fetchUrl(url)
            if err != nil {
                fmt.Printf("Error fetching %s: %v\n", url, err)
                return
            }

            fmt.Printf("Fetched %s\n", url)
        }(url)
    }

    fmt.Println("All requests launched!")
    wg.Wait()
    fmt.Println("Program finished.")
}

func fetchUrl(url string) error {
    // Detailed implementation omitted and not related to the task
    // _, err := http.Get(url)
    return nil
}