@NotNull
    private static List<LookupElement> getLookupBuilders(@NotNull final Map<String, PyStringFormatParser.SubstitutionChunk> chunks) {
      return chunks.keySet().stream()
        .map(PyStringFormatCompletionContributor::createLookUpElement)
        .collect(Collectors.toList());
    }
@NotNull
    private static List<LookupElement> getLookupBuilders(@NotNull final Map<String, PyStringFormatParser.SubstitutionChunk> chunks)