CLASS zcl_phone_number DEFINITION
  PUBLIC
  FINAL
  CREATE PUBLIC .

  PUBLIC SECTION.

    METHODS clean
      IMPORTING
        !number       TYPE string
      RETURNING
        VALUE(result) TYPE string
      RAISING
        cx_parameter_invalid.
  PROTECTED SECTION.
  PRIVATE SECTION.
ENDCLASS.


CLASS zcl_phone_number IMPLEMENTATION.

  METHOD clean.
" add your code here
  ENDMETHOD.
ENDCLASS.