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: check_metadata.m
    path of file: ./repos/tracacode/1911-COAWST/script/mfiles/rutgers/netcdf
    
    the code of the file until where you have to start completion: function S = check_metadata(Sinp)

%

    
function S = check_metadata(Sinp)

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% CHECK_METADATA:  Checks metadata structure for a ROMS NetCDF file
%
% Sout = check_metadata(Sinp)
%
% This function checks ROMS metadata structure for consistency and
% fills unassigned fields. This structure will be used elsewhere to
% create NetCDF files in a compact way (see "nc_create.m") or to
% append