Dionisia Edges reverse_words

lib/reverse_words.rb

@@ -1,4 +1,42 @@
 # A method to reverse each word in a sentence, in place.
 def reverse_words(my_words)
-  raise NotImplementedError
+  # raise NotImplementedError
+  return my_words if my_words.nil? || my_words.empty?
+
+  i = 0 # starting point of sentence
+  j = my_words.length # ending point of sentence
+
+  while i < j
+    while my_words[i] == " " && i < j
+      i += 1
+    end
+
+    word_start = i # starting point of next word in sentance
+
+    while my_words[i] != " " && i < j
+      i += 1
+    end
+
+    word_end = i - 1 # end point of word in sentence
+
+    word_reverse(my_words, word_start, word_end)
+  end
+  return
+end
+
+# helper method to reverse a word
+def word_reverse(my_words, word_start, word_end)
+  return nil if my_words == nil || my_words.length == 0
+
+  i = word_start # first index of character word word
+  j = word_end # last index of character in word
+
+  while i < j
+    temp = my_words[i] # swap with temporary variable
+    my_words[i] = my_words[j]
+    my_words[j] = temp
+    i += 1
+    j -= 1
+  end
+  return
 end