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: aamod_segment.m
    path of file: ./repos/automaticanalysis/aa_modules
    
    the code of the file until where you have to start completion: % AA module - normalisation using normalise or two 
    
function [aap,resp]=aamod_segment(aap, task, subj)
resp='';

switch task
    case 'report'
        
    case 'doit'
                                
        defs = aap.spm.defaults.normalise;
        defs.estimate.weight = '';
        
        
        % Determine the type of image we are expecting (T1, T2, etc.) from
        % the input and output streams specified in the XML file.        
        inStream = aap.tasklist.currenttask.inputstreams.stream{1};
                
        
        structImg = aas_getfiles_bystream(aap, subj, inStream);
        
        % Cheap and cheerful way of ensuring only one file is considered!
        if size(structImg, 1) > 1
            structImg = deblank(structImg(1,:));
            aas_log(aap,0,sprintf('Found more than one structural so using:\n%s',structImg));
        end