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: handle_extension.go
    path of file: ./repos/client/go/kbfs/tlf
    
    the code of the file until where you have to start completion: // Copyright 2016 Keybase Inc. All rights reserved.
// Use of this source code is governed by a BSD
// license that can be found in the LICENSE file.

package tlf

import (
	"errors"
	"fmt"
	"regexp"
	"str
    
func (e HandleExtension) string(isBackedByTeam bool) string {
	date := time.Unix(e.Date, 0).UTC().Format(handleExtensionDateFormat)
	var num string
	minNumberSuffixToShow := uint16(2)
	if isBackedByTeam {
		// When a TLF is backed by an implicit team, it should always
		// use the "#1" suffix, unlike for older TLFs.
		minNumberSuffixToShow = 1
	}
	if e.Number >= minNumberSuffixToShow {
		num = " #"
		num += strconv.FormatUint(uint64(e.Number), 10)
	}
	return fmt.Sprintf(handleExtensionFormat, e.Type.String(e.Username), date, num)
}