diff --git a/src/__pycache__/string_reversal.cpython-312.pyc b/src/__pycache__/string_reversal.cpython-312.pyc
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diff --git a/src/string_reversal.py b/src/string_reversal.py
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+++ b/src/string_reversal.py
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+def reverse_string(input_string: str) -> str:
+    """
+    Reverse the given input string using a manual character-by-character approach.
+
+    Args:
+        input_string (str): The 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(input_string, str):
+        raise TypeError("Input must be a string")
+    
+    # Convert string to a list of characters
+    chars = list(input_string)
+    
+    # Use two-pointer technique 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 back to string
+    return ''.join(chars)
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diff --git a/tests/__pycache__/test_string_reversal.cpython-312-pytest-8.3.5.pyc b/tests/__pycache__/test_string_reversal.cpython-312-pytest-8.3.5.pyc
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diff --git a/tests/test_string_reversal.py b/tests/test_string_reversal.py
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+++ b/tests/test_string_reversal.py
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+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("python") == "nohtyp"
+
+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_unicode():
+    """Test reversing a string with Unicode characters."""
+    assert reverse_string("こんにちは") == "はちにんこ"
+
+def test_reverse_string_invalid_input():
+    """Test that TypeError is raised for non-string input."""
+    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)
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