all test complete

lib/reverse_words.rb

@@ -1,4 +1,50 @@
 # A method to reverse each word in a sentence, in place.
-def reverse_words(my_words)
-  raise NotImplementedError
+def reverse_letters(my_string)
+
+  return my_string if my_string.length == 1
+
+  while my_string != nil
+    i = 0
+    j = (my_string.length - 1)
+    while i < j
+      temp = my_string[j]
+      my_string[j] = my_string[i]
+      my_string[i] = temp
+      j -= 1
+      i += 1
+    end
+    return my_string
+  end
+  return nil
+end
+
+def reverse_words(my_string)
+
+  return my_string if my_string == nil
+
+  results = ""
+  i = 0
+  temp = ""
+  j = (my_string.length - 1)
+
+  while i < my_string.length
+    if i == j
+      temp += my_string[i]
+      results << reverse_letters(temp)
+    elsif my_string[i] != " "
+      temp += my_string[i]
+    else
+      results << reverse_letters(temp)
+      temp = ""
+      results += " "
+    end
+    i += 1
+  end
+
+  u = 0
+  while u < results.length
+    my_string[u] = results[u]
+    u += 1
+  end
+  return my_string
 end