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: krb5conf.go
    path of file: ./repos/scan4all/vendor/github.com/jcmturner/gokrb5/v8/config
    
    the code of the file until where you have to start completion: // Package config implements KRB5 client and service configuration as described at https://web.mit.edu/kerberos/krb5-latest/doc/admin/conf_files/krb5_conf.html
package config

import (
	"bufio"
	"encoding/hex"
	"encoding/json"
	"errors"
	"fmt
    
func parseDuration(s string) (time.Duration, error) {
	s = strings.Replace(strings.TrimSpace(s), " ", "", -1)

	// handle Nd[NmNs]
	if strings.Contains(s, "d") {
		ds := strings.SplitN(s, "d", 2)
		dn, err := strconv.ParseUint(ds[0], 10, 32)
		if err != nil {
			return time.Duration(0), errors.New("invalid time duration")
		}
		d := time.Duration(dn*24) * time.Hour
		if ds[1] != "" {
			dp, err := time.ParseDuration(ds[1])
			if err != nil {
				return time.Duration(0), errors.New("invalid time duration")
			}
			d = d + dp
		}
		return d, nil
	}

	// handle Nm[Ns]
	d, err := time.ParseDuration(s)
	if err == nil {
		return d, nil
	}

	// handle N
	v, err := strconv.ParseUint(s, 10, 32)
	if err == nil && v > 0 {
		return time.Duration(v) * time.Second, nil
	}

	// handle h:m[:s]
	if strings.Contains(s, ":") {
		t := strings.Split(s, ":")
		if 2 > len(t) || len(t) > 3 {
			return time.Duration(0), errors.New("invalid time duration value")
		}
		var i []int
		for _, n := range t {
			j, err := strconv.ParseInt(n, 10, 16)
			if err != nil {
				return time.Duration(0), errors.New("invalid time duration value")
			}
			i = append(i, int(j))
		}
		d := time.Duration(i[0])*time.Hour + time.Duration(i[1])*time.Minute
		if len(i) == 3 {
			d = d + time.Duration(i[2])*time.Second
		}
		return d, nil
	}
	return time.Duration(0), errors.New("invalid time duration value")
}