package flatten
import (
	"log"
)
func Flatten(input interface{}) []interface{} {
	var ret []interface{}
	in, ok := input.([]interface{})
	if !ok {
		log.Println("unable to convert ot []interface{}")
	}
	ret = flat(in)
	if len(ret) == 0 {
		return []interface{}{}
	}
	return ret
}
func flat(in []interface{}) []interface{} {
	var ret []interface{}
	for _, item := range in {
		switch v := item.(type) {
		case []interface{}:
			ret = append(ret, flat(v)...)
		case nil:
			// do nothing
		default:
			ret = append(ret, item)
		}
	}
	return ret
}