[Reduce-algebra-developers] How to concatenate strings in Reduce?

[Nasser M. A. <nm...@12...>]

if I write

>redcsl -w
Reduce (CSL, rev 6657), 10-Dec-2023 ...

1: a:="hello";
2: b:="world";

How could make new variable "helloworld" by
  concatenating a and b?

I can't find such command in the manual or
by searching.

Do I have to write lisp code to do this? if so,
how? I know nothing about lisp. I also do not know
how to call lisp from Reduce top level.

I have a new to make string in Reduce by concatenating
other string. This is easy to do in Maple and Mathematica
using the cat function and using <> in Mathematica.

Does Reduce have such build in command?

Thanks,
--Nasser