Insert a break line in a content of a variable

Hi all, my problem is:
I want to put a break line at position 40 of a string (where exist a space), for example.
DATA: v_string TYPE string.
v_string = 'testline1_testline1_testline1_testline1 testline2_testline2_testline2_testline2'.
Because i want a result like this
testline1_testline1_testline1_testline1
testline2_testline2_testline2_testline2.
I tried with cl_abap_char_utilities=>cr_lf but are printing testline1_testline1_testline1_testline1##testline2_testline2_testline2_testline2.
I tried too with cl_abap_char_utilities=>new_line but don´t work.
Tks to all.

Hi sadavisa,
follow my program:
start----
DATA: gv_string TYPE string,
      gv_result TYPE string,
      gv_len TYPE i,
      gv_div TYPE f,
      gv_num_lin TYPE i,
      gv_len_upd type i,
      gv_position type i,
      gv_count type i,
      gv_40(1) type c,
      gv_39(1) type c,
      gv_38(1) type c,
      gv_37(1) type c,
      gv_36(1) type c,
      gv_35(1) type c.
gv_string = 'testline1_testline1_testline1_testline1 testline2_testline2_testline2_testline2'.
gv_len = STRLEN( gv_string ).
IF gv_len <= 40.
WRITE gv_string.
ELSE.
gv_div = gv_len / 40.
gv_num_lin = CEIL( gv_div ).
gv_count = 1.
WHILE gv_num_lin => gv_count.
    IF gv_num_lin = sy-index. "this code is executed only in the last time
      CONCATENATE gv_result gv_string INTO gv_result.
      gv_count = gv_count + 1.
      CONTINUE.
    ENDIF.
    gv_40 = gv_string+40(1).
    gv_39 = gv_string+39(1).
    gv_38 = gv_string+38(1).
    gv_37 = gv_string+37(1).
    gv_36 = gv_string+36(1).
    gv_35 = gv_string+35(1).
    IF gv_40 = space.
      gv_position = 40.
      PERFORM update_variables USING gv_position.
      continue.
    ELSEIF gv_39 = space.
      gv_position = 39.
      PERFORM update_variables USING gv_position.
      continue.
    ELSEIF gv_38 = space.
      gv_position = 38.
      PERFORM update_variables USING gv_position.
      continue.
    ELSEIF gv_37 = space.
      gv_position = 37.
      PERFORM update_variables USING gv_position.
      continue.
    ELSEIF gv_36 = space.
      gv_position = 36.
      PERFORM update_variables USING gv_position.
      continue.
    ELSEIF gv_35 = space.
      gv_position = 35.
      PERFORM update_variables USING gv_position.
      continue.
    endif.
    gv_count = gv_count + 1.
ENDWHILE.
ENDIF.
write gv_result.
*&      Form UPDATE_VARIABLES
      Update variables
     -->P_POSITION text
form UPDATE_VARIABLES using p_position type i.
CONCATENATE gv_result gv_string(p_position) cl_abap_char_utilities=>cr_lf INTO gv_result.
gv_len_upd = gv_len - p_position.
gv_string = gv_string+p_position(gv_len_upd).
CONDENSE gv_string.
gv_count = gv_count + 1.
endform.                    " UPDATE_VARIABLES
end----
So my question is why when i write CR_LF on file text go right and when i join into a variable and then write on screen go wrong.
Tks.

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