code: def main() -> None:
      """
      Main function that handles version updates based on branch names.
  
      Returns:
      --------
      None
  
      """
  
      args = parse_args()
      base_branch_name = args.base_branch
      source_branch_name = args.source_branch
  
      file_path = "version"
  
      if base_branch_name != "master":
          raise ValueError("Base branch name must be 'master'.")
  
      if source_branch_name is None:
          raise ValueError("Source branch name must not be empty/None.")
  
      # Get the version from the base branch
      current_version_base = get_version_from_branch(
          file_path, base_branch_name
      )
      # Get the version from source branch
      current_version_source = get_version_from_branch(
          file_path, source_branch_name
      )
  
      # Sanity check for version numbers of base and source branch
      if current_version_base is None or current_version_source is None:
          raise VersionFileReadError(
              f"Failed to read the version from {base_branch_name} or from branch."
          )
  
      # Increment the version based on the branch name pattern
      updated_version = increment_version(
          current_version_base, source_branch_name
      )
  
      print(f"Base branch: {base_branch_name}")
      print(f"Source branch: {source_branch_name}")
      print(f"Current version (base):   {current_version_base}")
      print(f"Current version (source): {current_version_source}")
      print(f"Updated version: {updated_version}")
  
      # Check if updated version is higher than version in base branch:
      version_comparison = compare_versions(
          updated_version, current_version_base
      )
      if version_comparison < 0:
          raise VersionUpdateError(
              "Error: Updated version is lower than version in base branch."
          )
      if version_comparison == 0:
          print("Version does not increase.")
          # Exit with error code 1
          sys.exit(1)
      if version_comparison > 0:
          if updated_version == current_version_source:
              print("Version is already updated.")
              # Exit with error code 1
              sys.exit(1)
          else:
              write_version_to_file(file_path, updated_version)
              print("Version updated in the file 'version'.")
  
file_path: FinQuant/scripts/update_version.py
imports: import argparse
  import re
  import subprocess
  import sys
  from typing import Optional, Tuple
label_desc: Use image node_id 9 for calling a global function with example usage: main() without return types