How to use md5 in golang ?

md5.go

import (
    "crypto/md5"
    "encoding/hex"
)

// Md5 encode the str
func Md5(s string) string {
    h := md5.New()
    n, err := h.Write([]byte(s))
    if err != nil || n == 0 {
        return ""
    }

    return hex.EncodeToString(h.Sum(nil))
}