removeQueryStrings = (_dna) => {
  const query = /(\?.*$)/;
  return _dna.replace(query, "");
}
Cleaning function for DNA strings. When DNA strings include an option, it
is added to the filename with a ?setting=value query string. It needs to be
removed to properly access the file name before Drawing.

@param {String} _dna The entire newDNA string
@returns Cleaned DNA string without querystring parameters.