letter_counter.rb

def letter_count(string)
  counting = Hash.new(0)
  indexing = Hash.new { |hash, key| hash[key] = [] }
  string.split('').each_with_index do |letter, index|
    next if letter == ' '
    counting[letter] += 1
    indexing[letter] << index
  end
  puts counting
  puts indexing
end

letter_count('hello, my name is martin!')