allow white space in string batch code example

Example 1: trimspace in bact file

@echo off 
set str = This string    has    a  lot  of spaces 
echo %str% 

set str=%str:=% 
echo %str%

Example 2: trim all space in bact file

@echo off
setlocal EnableDelayedExpansion
set S=  This  is  a  test
echo %S%.
for /f "tokens=* delims= " %%a in ('echo %S%') do (set b=%%a & set b=!b: =_! & echo !b!)
endlocal & goto :EOF