Null character removal in sap using a function module

Question

Little background :
1) we are using a lot of interfaces with legacy and the data in sap has null characters for example : phone#123 .
the prob is not on sap side but on bw side when i extract this data it converts to hex format and the load fails.
2) so i wrote a abap function module for the extractor which uses the function modules SRET_TEXT_TO_BINARY and SRET_BINARY_TO_TEXT and passed the variable that has the null character and replaced it with space.
3) the prob is i get null characters in a lot of fields now and i am not sure how i can pass it to SRET_BINARY_TO_TEXT OR SRET_TEXT_TO_BINARY as they are SAP standard and it takes in just a single variable. i have all my fields in a internal table .
I apologize for the the length of the message but any help is greatly appreciated.I want to know how to pass a internal table with null in all fields to a standard function module bec . The code is below :
=======================================================
  CALL FUNCTION 'SRET_TEXT_TO_BINARY'
    EXPORTING
      TEXT                        = input
    TEXT_LENGTH                 = -1
      LAISO                       = '00'
    IV_CATID                    = ' '
    IV_RFC_FOR_INITIALIZE       = ' '
   IMPORTING
    OUTPUT_LENGTH               =
      XBUFFER                     = v_hexa
   EXCEPTIONS
      FAILED                      = 1
      OTHERS                      = 2
  IF SY-SUBRC = 0.
*Replacing all NULL (X'00') values with SPACE (X'20')
  REPLACE ALL OCCURRENCES OF c_null IN v_hexa WITH c_space IN BYTE MODE.
    CALL FUNCTION 'SRET_BINARY_TO_TEXT'
      EXPORTING
        XBUFFER                     = v_hexa
        LAISO                       = '00'
      IV_CATID                    = ' '
      IV_RFC_FOR_INITIALIZE       = ' '
     IMPORTING
      OUTPUT_LENGTH               =
        TEXTBUFFER                  = output
     EXCEPTIONS
        FAILED                      = 1
        OTHERS                      = 2

Answer 1

The entire code :
=======================================================
FUNCTION YFR1_CA_U_NULL_SPACE.
""Local interface:
*"  IMPORTING
*"     REFERENCE(INPUT) TYPE  C
*"  EXPORTING
*"     REFERENCE(OUTPUT) TYPE  C
*"  EXCEPTIONS
*"      LENGTH_TOO_LONG
*"      FAILED
This function provides the functionality of replacing the NULL
characters with SPACE .
  DATA : v_hexa(100) TYPE X ,
         c_space(2) TYPE X VALUE '0020' ,
         c_null(2) TYPE X VALUE '0000' ,
         v_length TYPE i .
  COMPUTE v_length = STRLEN( input ) .
  IF v_length > '100'.
    RAISE length_too_long .
  ENDIF .
  CALL FUNCTION 'SRET_TEXT_TO_BINARY'
    EXPORTING
      TEXT                        = input
    TEXT_LENGTH                 = -1
      LAISO                       = '00'
    IV_CATID                    = ' '
    IV_RFC_FOR_INITIALIZE       = ' '
   IMPORTING
    OUTPUT_LENGTH               =
      XBUFFER                     = v_hexa
   EXCEPTIONS
      FAILED                      = 1
      OTHERS                      = 2
  IF SY-SUBRC = 0.
*Replacing all NULL (X'00') values with SPACE (X'20')
  REPLACE ALL OCCURRENCES OF c_null IN v_hexa WITH c_space IN BYTE MODE.
    CALL FUNCTION 'SRET_BINARY_TO_TEXT'
      EXPORTING
        XBUFFER                     = v_hexa
        LAISO                       = '00'
      IV_CATID                    = ' '
      IV_RFC_FOR_INITIALIZE       = ' '
     IMPORTING
      OUTPUT_LENGTH               =
        TEXTBUFFER                  = output
     EXCEPTIONS
        FAILED                      = 1
        OTHERS                      = 2
    IF SY-SUBRC <> 0.
      RAISE FAILED .
    ENDIF.
  ELSE.
    RAISE FAILED .
  ENDIF .
ENDFUNCTION.