diff --git a/algorithms_project/algorithms/arrays/two_pointer.py b/algorithms_project/algorithms/arrays/two_pointer.py
index 39c55c0..2b7fd04 100644
--- a/algorithms_project/algorithms/arrays/two_pointer.py
+++ b/algorithms_project/algorithms/arrays/two_pointer.py
@@ -1,18 +1,18 @@
 class Solution:
-    def reverseWords_manual(s):
+    def reverseWords_manual(string_word):
         res = ''
-        left, r = 0, 0
+        left, right = 0, 0
 
-        while r < len(s):
-            if s[r] != ' ':
-                r += 1
+        while right < len(string_word):
+            if string_word[right] != ' ':
+                right += 1
             else:
-                res += s[left:r+1][::-1]
-                r += 1
-                left = r
+                res += string_word[left:right+1][::-1]
+                right += 1
+                left = right
 
         res += ' '
-        res += s[left:r + 2][::-1]
+        res += string_word[left:right + 2][::-1]
         return res[1:]
 
 
@@ -32,10 +32,10 @@ def reverserWords(s):
 class Solution3:
     def reverseWords_manual1(s):
         res = ''
-        for r in range(len(s) + 1):
-            if r == len(s) or s[r] == ' ':
-                res += s[:r][::-1]
-                if r < len(s):
+        for right in range(len(s) + 1):
+            if right == len(s) or s[right] == ' ':
+                res += s[:right][::-1]
+                if right < len(s):
                     res += ' '
         return res
 
diff --git a/algorithms_project/tests/test_arrays/__init__.py b/algorithms_project/tests/test_arrays/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/algorithms_project/tests/test_arrays/test_two_pointer.py b/algorithms_project/tests/test_arrays/test_two_pointer.py
new file mode 100644
index 0000000..7c19846
--- /dev/null
+++ b/algorithms_project/tests/test_arrays/test_two_pointer.py
@@ -0,0 +1,11 @@
+import pytest
+from algorithms.arrays.two_pointer import Solution
+
+
+@pytest.mark.parametrize("input_str,expected", [
+    ("rac tar", "car rat"),
+    ("Hello World", "olleH dlroW"),
+    ("Python", "nohtyP"),
+])
+def test_reverse_words(input_str, expected):
+    assert Solution.reverseWords_manual(input_str) == expected