input: 
  from typing import List
  
  def calculate_rRNA_percent(htseq_counts: str, gtf_file: str) -> str:
      """ Calculate the percent of transcripts mapping to rRNA and also provide MT counts.
      Run the command "./rRNA_MT_count.py --gtf /path/to/GTF/file --htseq /path/to/HTseq_counts/file" to produce the output.
      The summary output file will be named "HTseq_counts_file_rRNAmtRNACounts.txt".
      >>> calculate_rRNA_percent('C17_3_S20_Aligned.out.srt.bam_htseq_combined_counts.txt', 'Mus_musculus.GRCm38.84.gtf')
      'C17_3_S20_Aligned.out.srt.bam_htseq_combined_counts_rRNAmtRNACounts.txt'
      """
  
output:     import subprocess
      import os
  
      htseq_counts_file = os.path.basename(htseq_counts)
      output_file = f"{htseq_counts_file}_rRNAmtRNACounts.txt"
  
      command = f"./rRNA_MT_count.py --gtf {gtf_file} --htseq {htseq_counts}"
      subprocess.run(command, shell=True, check=True)
  
      return output_file