From 749c771a33c259dd866c57421edc793f4cfe34bc Mon Sep 17 00:00:00 2001
From: labrocadabro <labrocadabro@users.noreply.github.com>
Date: Tue, 22 Apr 2025 11:23:13 -0300
Subject: [PATCH 1/4] Add string reversal function implementation

---
 src/string_reversal.py | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 src/string_reversal.py

diff --git a/src/string_reversal.py b/src/string_reversal.py
new file mode 100644
index 00000000..6c5177aa
--- /dev/null
+++ b/src/string_reversal.py
@@ -0,0 +1,19 @@
+def reverse_string(s: str) -> str:
+    """
+    Reverse the given string.
+
+    Args:
+        s (str): The input string to be reversed.
+
+    Returns:
+        str: The reversed string.
+
+    Raises:
+        TypeError: If the input is not a string.
+    """
+    # Check if input is a string
+    if not isinstance(s, str):
+        raise TypeError("Input must be a string")
+    
+    # Return the reversed string
+    return s[::-1]
\ No newline at end of file

From 16f6b7a6ff88da39582c69de72d44bad3917c4fc Mon Sep 17 00:00:00 2001
From: labrocadabro <labrocadabro@users.noreply.github.com>
Date: Tue, 22 Apr 2025 11:23:24 -0300
Subject: [PATCH 2/4] Add comprehensive tests for string reversal function

---
 tests/test_string_reversal.py | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 tests/test_string_reversal.py

diff --git a/tests/test_string_reversal.py b/tests/test_string_reversal.py
new file mode 100644
index 00000000..b215bd58
--- /dev/null
+++ b/tests/test_string_reversal.py
@@ -0,0 +1,34 @@
+import pytest
+from src.string_reversal import reverse_string
+
+def test_reverse_string_basic():
+    """Test basic string reversal."""
+    assert reverse_string("hello") == "olleh"
+    assert reverse_string("world") == "dlrow"
+
+def test_reverse_string_empty():
+    """Test reversing an empty string."""
+    assert reverse_string("") == ""
+
+def test_reverse_string_single_char():
+    """Test reversing a single character string."""
+    assert reverse_string("a") == "a"
+
+def test_reverse_string_with_spaces():
+    """Test reversing a string with spaces."""
+    assert reverse_string("hello world") == "dlrow olleh"
+
+def test_reverse_string_with_special_chars():
+    """Test reversing a string with special characters."""
+    assert reverse_string("a1b2c3") == "3c2b1a"
+
+def test_reverse_string_invalid_input():
+    """Test that TypeError is raised for non-string inputs."""
+    with pytest.raises(TypeError, match="Input must be a string"):
+        reverse_string(123)
+    
+    with pytest.raises(TypeError, match="Input must be a string"):
+        reverse_string(None)
+    
+    with pytest.raises(TypeError, match="Input must be a string"):
+        reverse_string(["list"])
\ No newline at end of file

From 96042d1c47dfde5620e4b5510d36b38e48a4c800 Mon Sep 17 00:00:00 2001
From: labrocadabro <labrocadabro@users.noreply.github.com>
Date: Tue, 22 Apr 2025 11:24:33 -0300
Subject: [PATCH 3/4] Implement manual string reversal with two-pointer
 approach

---
 src/string_reversal.py | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/src/string_reversal.py b/src/string_reversal.py
index 6c5177aa..bf57d9bc 100644
--- a/src/string_reversal.py
+++ b/src/string_reversal.py
@@ -1,6 +1,6 @@
 def reverse_string(s: str) -> str:
     """
-    Reverse the given string.
+    Reverse the given string using a manual character-by-character approach.
 
     Args:
         s (str): The input string to be reversed.
@@ -11,9 +11,27 @@ def reverse_string(s: str) -> str:
     Raises:
         TypeError: If the input is not a string.
     """
-    # Check if input is a string
+    # Type checking
     if not isinstance(s, str):
         raise TypeError("Input must be a string")
     
-    # Return the reversed string
-    return s[::-1]
\ No newline at end of file
+    # Handle empty string case
+    if len(s) <= 1:
+        return s
+    
+    # Manual string reversal
+    # Convert string to list of characters for easy manipulation
+    chars = list(s)
+    
+    # Two-pointer approach to swap characters
+    left, right = 0, len(chars) - 1
+    while left < right:
+        # Swap characters
+        chars[left], chars[right] = chars[right], chars[left]
+        
+        # Move pointers
+        left += 1
+        right -= 1
+    
+    # Convert list back to string and return
+    return ''.join(chars)
\ No newline at end of file

From 9b535cd12b26df81940a15b3e479d2fe38d5395e Mon Sep 17 00:00:00 2001
From: labrocadabro <labrocadabro@users.noreply.github.com>
Date: Tue, 22 Apr 2025 11:24:42 -0300
Subject: [PATCH 4/4] Update tests for comprehensive string reversal testing

---
 tests/test_string_reversal.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tests/test_string_reversal.py b/tests/test_string_reversal.py
index b215bd58..e6e96d9d 100644
--- a/tests/test_string_reversal.py
+++ b/tests/test_string_reversal.py
@@ -20,7 +20,11 @@ def test_reverse_string_with_spaces():
 
 def test_reverse_string_with_special_chars():
     """Test reversing a string with special characters."""
-    assert reverse_string("a1b2c3") == "3c2b1a"
+    assert reverse_string("a1b2c3!@#") == "#@!3c2b1a"
+
+def test_reverse_string_with_mixed_chars():
+    """Test reversing a string with mixed characters."""
+    assert reverse_string("Hello, World! 123") == "321 !dlroW ,olleH"
 
 def test_reverse_string_invalid_input():
     """Test that TypeError is raised for non-string inputs."""