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):
+    """
+    Reverse a given string manually without using slice notation or reverse().
+
+    Args:
+        input_string (str): The string to be reversed.
+
+    Returns:
+        str: The reversed string.
+
+    Raises:
+        TypeError: If the input is not a string.
+        ValueError: If the input string is None.
+    """
+    # Check for None input
+    if input_string is None:
+        raise ValueError("Input string cannot be None")
+    
+    # Check for non-string input
+    if not isinstance(input_string, str):
+        raise TypeError(f"Input must be a string, not {type(input_string).__name__}")
+    
+    # Manually reverse the string using a list-based approach
+    reversed_chars = []
+    for char in input_string:
+        reversed_chars.insert(0, char)
+    
+    return ''.join(reversed_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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+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 reversal of an empty string."""
+    assert reverse_string("") == ""
+
+def test_reverse_string_single_char():
+    """Test reversal of a single character."""
+    assert reverse_string("a") == "a"
+
+def test_reverse_string_with_spaces():
+    """Test reversal of string with spaces."""
+    assert reverse_string("hello world") == "dlrow olleh"
+
+def test_reverse_string_with_special_chars():
+    """Test reversal of string with special characters."""
+    assert reverse_string("hello, world!") == "!dlrow ,olleh"
+
+def test_reverse_string_unicode():
+    """Test reversal of unicode strings."""
+    assert reverse_string("こんにちは") == "はちにんこ"
+
+def test_reverse_string_none_input():
+    """Test that None input raises a ValueError."""
+    with pytest.raises(ValueError, match="Input string cannot be None"):
+        reverse_string(None)
+
+def test_reverse_string_non_string_input():
+    """Test that non-string input raises a TypeError."""
+    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(["list"])
+    with pytest.raises(TypeError, match="Input must be a string"):
+        reverse_string({"dict": "value"})
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