Content concatenation

Evaluate your content concatenation skills by completing the following tasks:

1. Append the current user to the ~/workspace/project-log/changelog.txt file:

   Changelog: Version: 1.0 username: current_user 

2. Append the ~/workspace/project-log/file-list.txt file content to the ~/workspace/project-log/changelog.txt file:

   Changelog Version: 1.0 username: current_user hello.txt hi.txt project-log