str_removeExtra_SpcTab
start time :  8Apr2022 12h25m46s

+--+-----+-------------------------------------------------------------------------+
|OK|test#|dat0                                                                     |
+--+-----+-------------------------------------------------------------------------+
| l|t01  |   NONLOCAL  chr_tab  chr_newline  chr_carriagereturn  chr_space  ;      |
+--+-----+-------------------------------------------------------------------------+
| l|t02  |IF  (= o non_whitespace_list@i)  THEN  first_chr := i  ;  EXIT ;  ENDIF ;|
+--+-----+-------------------------------------------------------------------------+
| l|t03  |krhello world    hhrr                                                    |
+--+-----+-------------------------------------------------------------------------+
| l|t04  |                                                                         |
+--+-----+-------------------------------------------------------------------------+
| l|t05  |                                                                         |
+--+-----+-------------------------------------------------------------------------+
| l|t06  |end                                                                      |
+--+-----+-------------------------------------------------------------------------+
+--+-----+-------------------------------------------------------------------+
|OK|test#|calc                                                               |
+--+-----+-------------------------------------------------------------------+
| l|t01  |NONLOCAL chr_tab chr_newline chr_carriagereturn chr_space ;        |
+--+-----+-------------------------------------------------------------------+
| l|t02  |IF (= o non_whitespace_list@i) THEN first_chr := i ; EXIT ; ENDIF ;|
+--+-----+-------------------------------------------------------------------+
| l|t03  |krhello world hhrr                                                 |
+--+-----+-------------------------------------------------------------------+
| l|t04  |                                                                   |
+--+-----+-------------------------------------------------------------------+
| l|t05  |                                                                   |
+--+-----+-------------------------------------------------------------------+
| l|t06  |end                                                                |
+--+-----+-------------------------------------------------------------------+
+--+-----+----------------------------------------------------------------------------------------------------
|OK|test#|comments                                                                                            
+--+-----+----------------------------------------------------------------------------------------------------
| l|t01  |spaces only (no [tab, \n, \r]s) - [lead, trail, extra] removed as expected                          
+--+-----+----------------------------------------------------------------------------------------------------
| l|t02  |spaces only - check case where no [lead, trail] spaces                                              
+--+-----+----------------------------------------------------------------------------------------------------
| l|t03  |as per optr defn, multiple sequential [spc, tab] replaced by single space, except [start, end] of st
+--+-----+----------------------------------------------------------------------------------------------------
| l|t04  |null OK - returns null                                                                              
+--+-----+----------------------------------------------------------------------------------------------------
| l|t05  |[space, tab] only becomes null                                                                      
+--+-----+----------------------------------------------------------------------------------------------------
| l|t06  |trivial case - works when there are no [lead, tail] white spaces                                    
+--+-----+----------------------------------------------------------------------------------------------------
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