sss

 Hello World! func CommonCharacters(strings []string) []string { charCount := make(map[rune]int) for _, str := range strings { for _, chr := range withoutDuplicates(str) { charCount[chr]++ } } result := make([]string, 0) for char, count := range charCount { if count == len(strings) { result = append(result, string(char)) } } return result } func withoutDuplicates(s string) string { var res []rune marks := make(map[rune]bool) for _, v := range s { if _, ok := marks[v]; !ok { res = append(res, v) } marks[v] = true } return string(res) }