package outbound

import (
	"sort"
	"strings"
)

func uniqueStrings(list []string) []string {
	if len(list) == 0 {
		return nil
	}
	seen := make(map[string]struct{}, len(list))
	result := make([]string, 0, len(list))
	for _, item := range list {
		item = strings.TrimSpace(item)
		if item == "" {
			continue
		}
		if _, ok := seen[item]; ok {
			continue
		}
		seen[item] = struct{}{}
		result = append(result, item)
	}
	sort.Strings(result)
	return result
}