msg = 'banana'
msg = msg.split('')
vowels = ['a', 'e', 'i', 'o', 'u']
sentence = ''
consonant = ''
 
msg.each do |a|
  next_index = msg[msg.index(a) + 1]
 
  if msg.index(a) == 0
    if vowels.include?(a)
      sentence << a
    else
      consonant = a + 'ay'
    end
  elsif next_index.nil?
    if consonant.empty?
      sentence << a
      sentence << 'ay'
    else
      sentence << consonant
    end
  else
    sentence << a
  end
end
 
puts  sentence

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