@Override
  public void invoke(@NotNull PsiElement element) {
    final PsiLiteralExpression charLiteral = (PsiLiteralExpression)element;
    final String charLiteralText = charLiteral.getText();
    final String stringLiteral = PsiLiteralUtil.stringForCharLiteral(charLiteralText);
    PsiReplacementUtil.replaceExpression(charLiteral, stringLiteral);
  }
@Override
  public void invoke(@NotNull PsiElement element)