gistfile1.rb

def first(string, length)
  string[0..length-1]
end

def rest(string, index)
  if string[index] == " "
    index += 1
  end
  return string[index..-1]
end

def wrap(string, column)
  if string.length <= column
    return string
  end

  index = string[0..column].rindex(" ") || column
  return first(string, index) + "\n" + wrap(rest(string, index), column)
end