check given string to see if in the form of [Book]Sheet1, if yes, break down and return book and sheet names
bool get_book_sheet_names( const string & strBookSheet, string & strBook, string & strSheet )
true if given string is in the correct form, false if not.
strSheet can be empty if strBookSheet = [Book1]
EX1
void get_book_sheet_names_ex1() { Worksheet wks; wks.Create(); string strBookName ; string strSheetName ; string strBookSheetName = wks_get_book_sheet_name(wks); if(!get_book_sheet_names(strBookSheetName, strBookName, strSheetName)) out_str("Fail"); }
origin.h