Install libnamespace-clean-perl by entering the following commands in the terminal:
sudo apt update sudo apt install libnamespace-clean-perl
module for keeping imports and functions out of the current namespace
namespace::clean is a Perl pragma for keeping imported functions out of the current namespace. This is especially important because Perl functions are naturally available as methods, which can complicate subclassing. . Using the namespace::clean pragma will remove all previously declared or imported symbols at the end of the current package's compile cycle. This means that functions called in the package itself will still be bound by their name, but they won't show up as methods on your class or instances.