You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: contains.go
    path of file: ./repos/photoprism/pkg/rnd
    
    the code of the file until where you have to start completion: package rnd

// ContainsUID checks if a slice of strings contains ContainsUID only.
func ContainsUID(s []string, prefix byte) bool {
	if len(s) < 1 {
		return false
	}

	for _, id := range s {
		switch prefix {
		case 0:
			if !IsUnique(id, prefix) {
				return false
			}
		default:
			if !IsUID(id, prefix) {
				return false
			}
		}
	}

	return true
}

// ContainsType checks if a slice of strings contains only random IDs of a given type and returns it.
func ContainsType(ids []string) (idType Type, idPrefix byte) {
	if len(ids) < 1 {
		retur
    
func ContainsType(ids []string) (idType Type, idPrefix byte) {
	if len(ids) < 1 {
		return TypeEmpty, PrefixNone
	}

	idType = TypeUnknown
	idPrefix = PrefixNone

	for _, id := range ids {
		t, p := IdType(id)

		if t == TypeUnknown {
			return TypeUnknown, PrefixNone
		} else if idType == TypeUnknown {
			idType = t
		} else if idType != t {
			return TypeMixed, PrefixNone
		}

		if t != TypeUID {
			continue
		} else if idPrefix == PrefixNone {
			idPrefix = p
		} else if idPrefix != PrefixMixed && idPrefix != p {
			idPrefix = PrefixMixed
		}
	}

	return idType, idPrefix
}