De-depuplicate code in packages

[redhatrises]

e.g.

    if len(p.Components) > 0 {
        buffer.WriteString(",\"components\":[")
        for i, v := range p.Components {
            bytesJSON, err := json.Marshal(v)
            if err != nil {

and

    if len(p.Standards) > 0 {
        buffer.WriteString(",\"standards\":[")
        for i, v := range p.Standards {
            bytesJSON, err := json.Marshal(v)
            if err != nil {