gistfile1.txt

s.split('').chunk_while { |i, j| i == j }.to_a.map { |a| (a << a.count if a.count > 1) ; a.uniq! }.join

@output = ""
def count_elem(arr)
  return @output if arr.blank?

  count = 1
  char = arr.first
  while arr.shift == arr.first
    count += 1
  end
  @output << (count > 1 ? char + count.to_s : char)
  count_elem(arr)
end