code: public File getFileFromDeletedFilesToCommit(int index) {
      CheckUtilities.checkIntIndexInListRange(deletedFilesToCommit, index);
      return deletedFilesToCommit.get(index);
    }
docs: Get the name of the deleted file that will be committed next time git-commit is executed
  currently located at the given index in the list.
  
  @param index
  Index in the list must be positive and less than the number of new files to commit
  @return the name of the file.