You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: spm_cfg_norm.m
    path of file: ./repos/spm/config
    
    the code of the file until where you have to start completion: function normalise = spm_cfg_norm
% SPM Configuration file for Spatial Normalisation
%__________________________________________________________________________

% John Ashburner
% Copyright (C) 2012-2022 Wellcome Centre for Human Neuroimaging


%--------------------------------------------------------------------------
% est Normalise: Estimate
%--------------------------------------------------------------------------
est      = cfg_exbranch;
est.tag  = 'est';
est.name = 'Normalise: Estimate';
est.val  = @()[esubjs_cfg eoptions_cfg];
est.help = {
    'Spatial normalisation performed via the segmentation r
    
function varargout = esubjs_cfg

persistent cfg
if ~isempty(cfg), varargout = {cfg}; return; end

%--------------------------------------------------------------------------
% vol Image to Align
%--------------------------------------------------------------------------
vol         = cfg_files;
vol.tag     = 'vol';
vol.name    = 'Image to Align';
vol.help    = {
    'The image that the template (atlas) data is warped into alignment with.'
    'The result is a set of warps, which can be applied to this image, or any other image that is in register with it.'
    }';
vol.filter  = 'image';
vol.ufilter = '.*';
vol.num     = [1 1];
vol.preview = @(f) spm_check_registration(char(f));

%--------------------------------------------------------------------------
% subj Subject
%--------------------------------------------------------------------------
subj         = cfg_branch;
subj.tag     = 'subj';
subj.name    = 'Subject';
subj.val     = {vol};
subj.help    = {'Data for this subject. The same parameters are used within subject.'};

%--------------------------------------------------------------------------
% esubjs Data
%--------------------------------------------------------------------------
esubjs        = cfg_repeat;
esubjs.tag    = 'esubjs';
esubjs.name   = 'Data';
esubjs.help   = {'List of subjects. Images of each subject should be warped differently.'};
esubjs.values = {subj};
esubjs.num    = [1 Inf];

[cfg,varargout{1}] = deal({esubjs});


%==========================================================================
function varargout = wsubjs_cfg

persistent cfg
if ~isempty(cfg), varargout = {cfg}; return; end