The Telegram Problem

README.md

Implement the function handle to accept lines of text and output reformatted text, wrapped at columnWidth characters, without breaking words.

So

Yr brunch Godard, readymade pug Pinterest gastropub put a bird on it Tumblr.
Sartorial swag beard, selvage bitters tofu vinyl.
Tattooed kogi organic scenester heirloom, cred four loko cardigan cray meh Portland master cleanse photo booth Shoreditch farm-to-table.

when wrapped at 30 characters becomes

Yr brunch Godard, readymade  
pug Pinterest gastropub put a  
bird on it Tumblr. Sartorial  
swag beard, selvage bitters  
tofu vinyl. Tattooed kogi  
organic scenester heirloom,  
cred four loko cardigan cray  
meh Portland master cleanse  
photo booth Shoreditch  
farm-to-table.  

Breaking like this:

Yr brunch Godard, readymade pu  
g Pinterest gastropub put a bi  
rd on it Tumblr. Sartorial swa  
g beard, selvage bitters tofu   
vinyl. Tattooed kogi organic s  
cenester heirloom, cred four l  
oko cardigan cray meh Portland  
 master cleanse photo booth Sh  
oreditch farm-to-table.  

is incorrect.

main.go

package main

import (
	"bufio"
	"os"
	"strconv"
)

var columnWidth uint64 // How long each line should be

func handle(line string) {
	// Implement this!
}

func main() {
	columnWidth, _ = strconv.ParseUint(os.Args[1], 10, 8)

	input := bufio.NewReader(os.Stdin)

	for line, err := input.ReadString('\n'); err == nil; line, err = input.ReadString('\n') {
		handle(line)
	}
}

BUG:

run go main.go 5

INPUT:

Yr brunch Godard, readymade pug Pinterest gastropub put a bird on it Tumblr. Sartorial swag beard, selvage bitters tofu vinyl. Tattooed kogi organic scenester heirloom, cred four loko cardigan cray meh Portland master cleanse photo booth Shoreditch farm-to-table.

OUTPUT:

Yr
brunch
Godard,
readymade
pug
Pinterest
gastropub
put
a
bird
on
it
Tumblr.
Sartorial
swag
beard,
selvage
bitters
tofu
vinyl.
Tattooed
kogi
organic
scenester
heirloom,
cred
four
loko
cardigan
cray
meh
Portland
master
cleanse
photo
booth
Shoreditch

farm-to-table.