How to wait for all goroutines to complete in Go without using time.Sleep?

Hello everyone! I started learning Go and encountered a problem with goroutine synchronization. I'm writing a simple program that launches several goroutines for parallel data processing, but I can't get the main function to wait for them to complete. Here's my code: ```go package main import ( "fmt" "time" ) func worker(id int) { fmt.Printf("Worker %d started\n", id) time.Sleep(2 * time.Second) // simulating work fmt.Printf("Worker %d finished\n", id) } func main() { for i := 1; i <= 5; i++ { go worker(i) } // Program exits immediately without waiting for goroutines fmt.Println("Main function ended") } ``` The problem is that the program finishes instantly without waiting for the goroutines to execute. I know that you can use `time.Sl