class Array

def rotate
  return self if empty?
  # Rotate the array by moving the first element to the end
  first_element = shift
  push(first_element)
  self
end

def split_names
  first_names = []
  last_names = []
  full_names = []
  first_names_ended = false
  last_names_ended = false
  sections = [[]]
  idx = 0
  each do |line|
    if line.strip.empty? || line !~ /^[[:word:]]/i
      idx += 1
      sections[idx] = []
    else
      sections[idx] << line.strip
    end
  end
  if sections.length == 1
    first_names = []
    last_names = []
    full_names = sections[0]
  elsif sections.length == 2
    first_names = sections[0]
    last_names = sections[1]
    full_names = []
  else
    first_names = sections[0]
    last_names = sections[1]
    full_names = sections[2]
  end
  first_names.delete_if(&:empty?)
  last_names.delete_if(&:empty?)
  full_names.delete_if(&:empty?)
  [first_names, last_names, full_names]
end

def split_terminators
  terminators = []
  extended_punctuation = []
  terminators_ended = false
  each do |line|
    if line.include?(',') && !terminators_ended
      terminators << line.split(',').map(&:strip)
    elsif terminators_ended
      extended_punctuation << line.split(',').map(&:strip)
    else
      terminators_ended = true
    end
  end
  terminators.delete_if { |line| line[1].empty? }
  extended_punctuation.delete_if { |line| line[1].empty? }
  [terminators, extended_punctuation]
end