private static @Nullable String tryCompleteQuotes(@Nullable PsiElement fileContext) {
    if (fileContext != null) {
      if (fileContext.getText().startsWith("\"")) return "''";
      if (fileContext.getText().startsWith("'")) return "\"\"";
    }
    return null;
  }
private static @Nullable String tryCompleteQuotes(@Nullable PsiElement fileContext)