```ruby
require "fit-commit/runner"

module FitCommit
  def self.run
    runner.run || exit(1)
  end

  private

  def self.runner
    FitCommit::Runner.new(message_path, branch_name)
  end

  def self.message_path
    ENV.fetch("COMMIT_MESSAGE_PATH")
  end

  def self.branch_name
    `git branch | grep '^\*' | cut -b3-`.strip
  end
end
```

Simplify git command to get branch name
user
```ruby
require "fit-commit/runner"

module FitCommit
  def self.run
    runner.run || exit(1)
  end

  private

  def self.runner
    FitCommit::Runner.new(message_path, branch_name)
  end

  def self.message_path
    ENV.fetch("COMMIT_MESSAGE_PATH")
  end

  def self.branch_name
    `git name-rev --name-only HEAD`.strip
  end
end
```
assistant