func (r *Result) Message(message string, args ...interface{}) *Result {
	if r.Error != nil {
		if len(args) == 0 {
			r.Error.Message = message
		} else {
			r.Error.Message = fmt.Sprintf(message, args...)
		}
	}
	return r
}
Message Set Result message by string or format string with args
package validation
import (
	"fmt"
	"reflect"
	"regexp"
	"strings"
)
type ValidFormer interface {
	Valid(*Validation)
}
type Error struct {
	Message, Key, Name, Field, Tmpl string
	Value                           interface{}
	LimitValue                      interface{}
}
func (e *Error) String() string {
	if e == nil {
		return ""
	}
	return e.Message
}
func (e *Error) Error() string { return e.String() }
type Result struct {
	Error *Error
	Ok    bool
}
func (r *Result) Key(key string) *Result {
	if r.Error != nil {
		r.Error.Key = key
	}
	return r
}