Ruby method for cleaning URL strings for display

string.rb

class String
  # remove protocol, www, and trailing slash from URL string
  def to_clean_url
    u = self

    if u.start_with?('http://www.')
      u = u[11..-1]
    elsif u.start_with?('https://www.')
      u = u[12..-1]
      
    elsif u.start_with?('http://')
      u = u[7..-1]
    elsif u.start_with?('https://')
      u = u[8..-1]
    end

    if u.end_with?('/')
      u = u.chomp('/')
    end

    u
  end
end