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: version.go
    path of file: ./repos/vagrant/internal/version
    
    the code of the file until where you have to start completion: // Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: BUSL-1.1

package version

import (
	"bytes"
	"fmt"
	"regexp"
)

var (
	// The git commit that was compiled. This will be filled in by the compiler.
	GitCommit   string
	GitDescribe string

	Version           = "3.0.0"
	VersionPrerelease = ""
	VersionMetadata   = ""
)

// VersionInfo
type VersionInfo struct {
	Revision
    
func (c *VersionInfo) VersionNumber() string {
	if Version == "unknown" && VersionPrerelease == "unknown" {
		return "(version unknown)"
	}

	version := c.Version

	if c.VersionPrerelease != "" && c.GitDescribe == "" {
		version = fmt.Sprintf("%s-%s", c.Version, c.VersionPrerelease)
	}

	if c.VersionMetadata != "" {
		version = fmt.Sprintf("%s+%s", c.Version, c.VersionMetadata)
	}

	return version
}