[Ruby] exercise _ Double Letter Count

Write a method that takes in a string and returns the number of times that the same letter repeats twice in a row.

def double_letter_count(string)

end

puts double_letter_count("the jeep rolled down the hill") #=> 3
puts double_letter_count("bootcamp") #=> 1

# solution
def double_letter_count(string)
  count = 0

  string.each_char.with_index do |char, i|
    if string[i] == string[i + 1]
      count += 1
    end
  end

  return count
end

puts double_letter_count("the jeep rolled down the hill") #=> 3
puts double_letter_count("bootcamp") #=> 1