/**
  * A method that find the length of longest gene.
  *
  * @param genes The genes of a dna strand.
  * @return The Length of longer gene.
  */
 public int longestGene(StorageResource sr) {
   int maxlength = 0;
   for (String a : sr.data()) {
     maxlength = Math.max(a.length(), maxlength);
   }
   return maxlength;
 }