Create a v4 UUID in go

uuid.go

package main

import(
	"crypto/rand"
)

func GenUUIDv4() string {
	u := make([]byte, 16)
	rand.Read(u)
	//Set the version to 4
	u[6] = (u[6] | 0x40) & 0x4F
	u[8] = (u[8] | 0x80) & 0xBF
	return fmt.Sprintf("%x-%x-%x-%x-%x", u[0:4], u[4:6], u[6:8], u[8:10], u[10:])
}