Copy different field name, the original field had no value

[mingzaily]

Describe the feature

define

    type SrcTags struct {
        FieldA string
        FieldB string
    }

    type DestTags struct {
        FieldA string
        FieldB string
        FieldC string `copier:"FieldA"`
    }

    dst := &DestTags{}
    src := &SrcTags{
        FieldA: "A",
        FieldB: "B",
    }

now, the original field had no value

    copier.Copy(dst, src)
    fmt.Printf("%+v", dst)
    // &{FieldA: FieldB:B FieldC:A}

i want the original field had value

    copier.Copy(dst, src)
    fmt.Printf("%+v", dst)
    // &{FieldA:A FieldB:B FieldC:A}

Motivation

Hope to have this feature，I can only use loops now.