Even if a footer message has already been added to the file specified in config.base, if I execute the script to add a change log for the newly developed part, a footer message will be added one by one every time.

• before

  This Changelog was automatically generated by...

• after

  This Changelog was automatically generated by...
  This Changelog was automatically generated by...

• after 2 times (keep replicating infinitely)

  This Changelog was automatically generated by...
  This Changelog was automatically generated by...
  This Changelog was automatically generated by...

Maybe, this code doesn't work:

• Environment
  • macOS Catalina (10.15.4)
  • project: giturl
  • ruby: ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-darwin19]