reverse words

lib/reverse_words.rb

@@ -1,4 +1,60 @@
 # A method to reverse each word in a sentence, in place.
+require 'pry'
+def string_reverse(my_string)
+  return if my_string == nil || my_string.length < 1
+  i = 0 #first ele
+  j = my_string.length - 1 #last ele
+  while i < j # until position of first ele meets last, so there is the center element in between
+    temp = my_string[i] #stores frist ele in temp
+    my_string[i] = my_string[j] #sets first ele to the last ele's position
+    my_string[j] = temp #sets last element to first ele's position
+    i += 1 #increment
+    j -= 1
+  end
+  return my_string
+end
+
+# "   evol  "
+
 def reverse_words(my_words)
-  raise NotImplementedError
+  # puts my_words
+  unless my_words == nil || my_words.empty?
+    last = 0
+    first = 0
+    until last == my_words.length - 1
+      while my_words[first] == " " && first != my_words.length - 1
+        first += 1
+      end
+      last = first
+      while my_words[last] != " " && last != my_words.length - 1
+        last += 1
+      end
+      if first == last || last == my_words.length - 1
+        my_words[first..last] = string_reverse(my_words[first..last])
+      else
+        my_words[first..last - 1] = string_reverse(my_words[first..last - 1])
+      end
+      first = last
+    end
+  end
+  # puts "finished #{my_words}"
 end
+#1, check if first character is " "
+#check if the index to the right of it (the next highest index) is a space
+#if true, that section is one word
+# (the beginning and end of each word needs an index)
+#once i find a since word section call string_reverse helper method on it
+#else, continue incrementation +1
+
+# "En gineer"
+# "reenig nE"
+#letter at index0 must swap with final index
+#letter at index0 decrements index[0] -1
+# so lets assign i = index[0] which is E
+#so i = E
+# index[i - 1] = -1
+# j = index[length -1]
+# so j = r
+# the value in j should be assigned to the first position
+# storage = index[0]
+# j = storage