Discard header and footer

main.go

package main

import "fmt"

func filter(s []int, c chan int, header int, footer int) {

	var b []int
	var e int
	fmt.Println("test print in routing")
	fmt.Printf("Initial elemements: %d\n", len(s))
	for _, v := range s {
		//fmt.Printf("Iteration: %d\n", k)
		if header > 0 {
			fmt.Printf("Discarded as header: %d\n", v)
			header--
			continue
		}

		if len(b) >= footer {
			e, b = b[0], b[1:]
			c <- e
		} else {
			//fmt.Printf("Size: %d\n", len(b))
		}

		b = append(b, v)
	}
	
	close(c)
	fmt.Printf("Discarded as footer: %v\n", b)
}

func main() {
	fmt.Print("before\n")
	s := []int{7, 2, 8, -9, 4, 0}

	c := make(chan int)
	go filter(s, c, 1, 2)
	
	for i := range c {
		fmt.Println(i)
	}
}