reverse_words.rb

# A method to reverse each word in a sentence, in place.
# def string_reverse(my_string)
#
#   if my_string == nil
#     return nil
#   elsif my_string.length == 1
#     return my_string
#   elsif
#     my_string.length > 1
#     temp = ""
#     i = 0
#     j = (my_string.length - 1)
#     while i < j
#       temp = my_string[i]
#       my_string[i] = my_string[j]
#       my_string[j] = temp
#       i += 1
#       j -= 1
#     end
#     return my_string
#   end
# end


def reverse_words(my_words)
  if my_words == nil || my_words.length == 0
    return nil
  else
    start = 0
    ender = 0

    my_words.length.times do |i|
      ender = i

      if my_words[i] == " "
        ender = i - 1
        while start < ender
          temp = my_words[ender]
          my_words[ender] = my_words[start]
          my_words[start] = temp
          start += 1
          ender -= 1
        end
        start = i + 1
      end
    end

    while start < ender
      temp = my_words[ender]
      my_words[ender] = my_words[start]
      my_words[start] = temp
      start += 1
      ender -= 1
    end
  end
  return my_words
end