static String getLiteralText(PsiLiteralExpression firstArgument) {
    final String text = LiteralFormatUtil.removeUnderscores(firstArgument.getText());
    final char c = text.charAt(text.length() - 1);
    return c == 'd' || c == 'D' || c == 'f' || c == 'F'
           ? text.substring(0, text.length() - 1)
           : text;
  }
static String getLiteralText(PsiLiteralExpression firstArgument)