func (b Body) IsEmpty() bool {
	return b == ""
}
IsEmpty body is empty
package job
import (
	"time"
)
type Topic string
type ID string
type Delay time.Duration
type TTR time.Duration
type Body string
type Empty interface {
	IsEmpty() bool
}
func (t Topic) IsEmpty() bool {
	return t == ""
}
func (id ID) IsEmpty() bool {
	return id == ""
}