Remove unnecessary functions and data

        :return: None

def remove_unnecessary_stuff(self):
        """
        Remove unnecessary functions and data

        :return: None
        """

        glibc_functions_blacklist = {
            '_start',
            '_init',
            '_fini',
            '__gmon_start__',
            '__do_global_dtors_aux',
            'frame_dummy',
            'atexit',
            'deregister_tm_clones',
            'register_tm_clones',
            '__x86.get_pc_thunk.bx',
            '__libc_csu_init',
            '__libc_csu_fini',
        }

        glibc_data_blacklist = {
            '__TMC_END__',
            '_GLOBAL_OFFSET_TABLE_',
            '__JCR_END__',
            '__dso_handle',
            '__init_array_start',
            '__init_array_end',

            #
            'stdout',
            'stderr',
            'stdin',
            'program_invocation_short_',
            'program_invocation_short_name',
            'program_invocation_name',
            '__progname_full',
            '_IO_stdin_used',
            'obstack_alloc_failed_hand',
            'optind',
            'optarg',
            '__progname',
            '_environ',
            'environ',
            '__environ',
        }

        glibc_references_blacklist = {
            'frame_dummy',
            '__do_global_dtors_aux',
        }

        self.procedures = [p for p in self.procedures if p.name not in glibc_functions_blacklist and not p.is_plt]

        self.data = [d for d in self.data if not any(lbl.name in glibc_data_blacklist for _, lbl in d.labels)]

        for d in self.data:
            if d.sort == 'pointer-array':
                for i in range(len(d.content)):
                    ptr = d.content[i]
                    if isinstance(ptr, Label) and ptr.name in glibc_references_blacklist:
                        d.content[i] = 0