removing spaces from a string

[Peter Tury <tury.peter@gmail.com>]

Hi,

how can I most simply remove all spaces from a string? I plan to have a
variable what holds the string, so functions what operates on regions,
rectangles or any parts of a buffer, etc. are not good (I guess).

I would need something like this: (remove-all-space a-sting-var); if e.g.
(setq a-string-var "abcd ef   dg ") then this should return "abcdefdg" what
I will pass forward to another function (namely: process-send-string).

Thanks!
P