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: write_neuralynx_nts.m
    path of file: ./repos/fecgsyn/subfunctions/data-generation/libs/fieldtrip/fileio/private
    
    the code of the file until where you have to start completion: function write_neuralynx_nts(filename, nts)

% WRITE_NEURALYNX_NTS writes spike timestamps to a NTS file
%
% Use as
%   write_neuralynx_nts(filename, nts)
%
% See also READ_NEURALYNX_NTS

% Copyright (C) 2007, Robert Oostenveld
%
% This file is part of FieldTrip, see http://www.fieldtriptoolbox.org
% for the documentation and details.
%
%    FieldTrip is free software: you can redistribute it and/or modify

    
function write_neuralynx_nts(filename, nts)

% WRITE_NEURALYNX_NTS writes spike timestamps to a NTS file
%
% Use as
%   write_neuralynx_nts(filename, nts)
%
% See also READ_NEURALYNX_NTS

% Copyright (C) 2007, Robert Oostenveld
%
% This file is part of FieldTrip, see http://www.fieldtriptoolbox.org
% for the documentation and details.
%
%    FieldTrip is free software: you can redistribute it and/or modify
%    it under the terms of the GNU General Public License as published by
%    the Free Software Foundation, either version 3 of the License, or
%    (at your option) any later version.
%
%    FieldTrip is distributed in the hope that it will be useful,
%    but WITHOUT ANY WARRANTY; without even the implied warranty of
%    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
%    GNU General Public License for more details.
%
%    You should have received a copy of the GNU General Public License
%    along with FieldTrip. If not, see <http://www.gnu.org/licenses/>.
%
% $Id$

if ~isa(nts.TimeStamp, 'uint64')
  ft_error('timestamps should be uint64');
end

fid  = fopen_or_error(filename, 'wb', 'ieee-le');

% construct the header
buf  = [];
buf  = [buf sprintf('######## Neuralynx Data File Header\r\n')];
buf  = [buf sprintf('## File Name: %s\r\n', filename)];
buf  = [buf sprintf('## Time Opened: (m/d/y): %s  At Time: %s\r\n', datestr(clock, 'mm/dd/yy'), datestr(clock, 'HH:MM:SS'))];
f = fieldnames(nts.hdr);
for i=1:length(f)
  v = getfield(nts.hdr, f{i});
  switch class(v)
    case 'char'
      buf = [buf sprintf('-%s\t%s\r\n', f{i}, v)];
    case 'double'
      buf = [buf sprintf('-%s\t%g\r\n', f{i}, v)];
    otherwise
      ft_error('unknown class in writing header');
  end