| 12345678910111213141516171819 | package commonimport (	"crypto/md5"	"fmt"	"io")func MD5(src string) string {	h := md5.New()	io.WriteString(h, src)	return fmt.Sprintf("%x", h.Sum(nil))}func MD5ByLength16(src string) string {	res := MD5(src)	res = res[8:]	res = res[:16]	return res}
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