---- initial state:
---- end of initial state:
---- append line:
this is 1st line
---- end of append line:
---- append move lines:
this is 1st line
2nd

4th
 and 5 line
6th line
---- end of append move lines:
---- prepend line(s) No.1 :
abc
def
this is 1st line
2nd

4th
 and 5 line
6th line
---- end of prepend line(s) No.1 :
---- prepend line(s) No.2 :

abc
def
this is 1st line
2nd

4th
 and 5 line
6th line
---- end of prepend line(s) No.2 :
---- prepend line(s) No.3 :


b

abc
def
this is 1st line
2nd

4th
 and 5 line
6th line
---- end of prepend line(s) No.3 :
---- append line(s) No.1:


b

abc
def
this is 1st line
2nd

4th
 and 5 line
6th line
abc
def
---- end of append line(s) No.1:
---- append line(s) No.2:


b

abc
def
this is 1st line
2nd

4th
 and 5 line
6th line
abc
def

---- end of append line(s) No.2:
---- append line(s) No.3:


b

abc
def
this is 1st line
2nd

4th
 and 5 line
6th line
abc
def


b

---- end of append line(s) No.3:
---- remove top/bottom empty lines:
b

abc
def
this is 1st line
2nd

4th
 and 5 line
6th line
abc
def


b
---- end of remove top/bottom empty lines:
---- insert spaces before each lines
***b
***
***abc
***def
***this is 1st line
***2nd
***
***4th
***and 5 line
***6th line
***abc
***def
***
***
***b
---- end of insert spaces before each lines
---- concatenate all strings
***b
***
***abc
***def
***this is 1st line
***2nd
***
***4th
***and 5 line
***6th line
***abc
***def
***
***
***b
---- end of concatenate all strings
---- clear
---- one more simple lines
[]
---- append indented lines:
Hello, World!
 Good morning !!
[]
---- releasing ...
*** test program for CText class
bye
