You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.go
    path of file: ./repos/build-web-application-with-golang/fa/code/src/apps/ch.2.5/box_example
    
    the code of the file until where you have to start completion: package main

import "fmt"

const (
	WHITE = iota
	BLACK
	BLUE
	RED
	YELLOW
)

type Color byte

type Box struct {
	width, height, depth float64
	color                Color
}

type BoxList []Box //a slice of boxes

func (b Box) Volume() float64 {
	return b.width * b.height * b.depth
}

func (b *Box) SetColor(c Color) {
	b.color = c
}

func (bl BoxList) BiggestsColor() Color {
	v := 0.00
	k := Color(WHITE)
	for _, b := range bl {
		if b.Volume() > v {
			v = b.V
    
func main() {
	boxes := BoxList{
		Box{4, 4, 4, RED},
		Box{10, 10, 1, YELLOW},
		Box{1, 1, 20, BLACK},
		Box{10, 10, 1, BLUE},
		Box{10, 30, 1, WHITE},
		Box{20, 20, 20, YELLOW},
	}

	fmt.Printf("We have %d boxes in our set\n", len(boxes))
	fmt.Println("The volume of the first one is", boxes[0].Volume(), "cmÂ³")
	fmt.Println("The color of the last one is", boxes[len(boxes)-1].color.String())
	fmt.Println("The biggest one is", boxes.BiggestsColor().String())

	fmt.Println("Let's paint them all black")
	boxes.PaintItBlack()
	fmt.Println("The color of the second one is", boxes[1].color.String())

	fmt.Println("Obviously, now, the biggest one is", boxes.BiggestsColor().String())
}