diff --git a/solutions/count_vowels.py b/solutions/count_vowels.py
new file mode 100644
index 000000000..7d7328559
--- /dev/null
+++ b/solutions/count_vowels.py
@@ -0,0 +1,47 @@
+"""
+This module provides a function to count the number of vowels in a given text.
+The vowels here are a,e,i,o,u,A,E,I,O,U.
+
+Function:
+- count_vowels: Counts vowels in a provided string.
+
+Raises:
+        TypeError: If the input `s` is not a string.
+        ValueError: If the input `s` is an empty string.
+
+Example:
+    >>> vowel_counter("Deadline")
+    4
+"""
+
+
+def count_vowels(s) -> int:
+    """
+    Counts the number of vowels in the given string.
+
+    Parameters:
+    s (str): The string in which to count vowels.
+
+    The vowels are "a,e,i,o,u,A,E,I,O,U"
+
+    Returns:
+    int: The number of vowels in the string.
+
+    Example:
+    >>> count_vowels("hello")
+    2
+    >>> count_vowels("Nelsona")
+    3
+    >>> count_vowels("This is amazing.")
+    5
+    """
+    # Defensive assertion: Ensure the input is a string
+    if not isinstance(s, str):
+        raise TypeError("Input must be a string")
+
+    # Defensive assertion: Ensure the string is not empty
+    if not s:
+        raise ValueError("Input string cannot be empty")
+
+    vowels = "aeiouAEIOU"  # Define vowels (both lowercase and uppercase)
+    return sum(1 for char in s if char in vowels)
diff --git a/solutions/fizz_buzz.py b/solutions/fizz_buzz.py
new file mode 100644
index 000000000..36daead22
--- /dev/null
+++ b/solutions/fizz_buzz.py
@@ -0,0 +1,61 @@
+"""
+This module provides a function that generates a list of numbers from 1 to n 
+with specific rules for multiples of 3 and 5.
+
+For each number in the range:
+- For multiples of 3, "Fizz" is added instead of the number.
+- For multiples of 5, "Buzz" is added instead of the number.
+- For multiples of both 3 and 5, "FizzBuzz" is added instead of the number.
+
+Features:
+- Input validation to ensure that the input is a positive integer.
+- Customizable output format (e.g., changing the words "Fizz" and "Buzz" 
+  to user-defined strings).
+- Ability to generate results as a string instead of a list.
+
+Example:
+>>> fizz_buzz(15)
+[1, 2, 'Fizz', 4, 'Buzz', 'Fizz', 7, 8, 'Fizz', 'Buzz', 11, 'Fizz', 13, 
+  14, 'FizzBuzz']
+"""
+
+
+def fizz_buzz(n: int) -> list:
+    """
+    Generates a list of numbers from 1 to n with the following rules:
+    - For multiples of 3, "Fizz" is added instead of the number.
+    - For multiples of 5, "Buzz" is added instead of the number.
+    - For multiples of both 3 and 5, "FizzBuzz" is added instead of the number.
+
+    Parameters:
+    n (int): The upper limit of the range (inclusive) to generate.
+
+    Returns:
+    list: A list containing the numbers and/or string representations according 
+    to the rules.
+
+    Raises:
+    TypeError: If the input is not an integer.
+    ValueError: If the input is less than 1.
+
+    Example:
+    >>> fizz_buzz(10)
+    [1, 2, 'Fizz', 4, 'Buzz', 'Fizz', 7, 8, 'Fizz', 'Buzz']
+    
+    """
+    # Defensive assertions
+    if not isinstance(n, int):
+        raise TypeError("Input must be an integer.")
+    if n < 1:
+        raise ValueError("Input must be greater than or equal to 1.")
+    results = []  # Initialize an empty list to store the results
+    for i in range(1, n + 1):
+        if i % 3 == 0 and i % 5 == 0:
+            results.append("FizzBuzz")  # Append "FizzBuzz" for multiples of both 3 and 5
+        elif i % 3 == 0:
+            results.append("Fizz")      # Append "Fizz" for multiples of 3
+        elif i % 5 == 0:
+            results.append("Buzz")      # Append "Buzz" for multiples of 5
+        else:
+            results.append(i)           # Append the number itself if not a multiple of 3 or 5
+    return results  # Return the list of results
diff --git a/solutions/reverse_string.py b/solutions/reverse_string.py
new file mode 100644
index 000000000..cc8a98ae8
--- /dev/null
+++ b/solutions/reverse_string.py
@@ -0,0 +1,43 @@
+"""
+This module provides a function to reverse an inputed string.
+
+Function:
+    reverse_string(s: str) -> str:
+        Reverses the input string and returns the reversed one.
+
+Features:
+- Simple and efficient string reversal.
+- Built-in error handling for invalid inputs.
+
+Raises:
+        TypeError: If the input `s` is not a string.
+        ValueError: If the input `s` is an empty string.
+Example:
+    >>> reverse_string("Deadline")
+    enildaeD
+"""
+
+
+def reverse_string(s: str) -> str:
+    """
+    Reverses the given string.
+
+    Parameters:
+    s (str): The string to be reversed.
+
+    Returns:
+    str: The reversed string.
+
+    Example:
+    >>> reverse_string("hello")
+    'olleh'
+    >>> reverse_string("12345")
+        '54321'
+    """
+    # Defensive assertion: Ensure the input is a string
+    if not isinstance(s, str):
+        raise TypeError("Input must be a string")
+    # Defensive assertion: Ensure the string is not empty
+    if not s:
+        raise ValueError("Input string cannot be empty")
+    return s[::-1]  # Return the reversed string using slicing
diff --git a/solutions/tests/test_count_vowels.py b/solutions/tests/test_count_vowels.py
new file mode 100644
index 000000000..8e488792f
--- /dev/null
+++ b/solutions/tests/test_count_vowels.py
@@ -0,0 +1,75 @@
+"""
+This module contains unit tests for the count_vowels module.
+It includes test cases for the following function:
+- count_vowels: Test the function that counts vowels in a string.
+
+Tests cover various cases including normal strings, empty strings, and case insensitivity.
+
+Usage:
+    Run tests using unittest framework:
+    >>> python -m unittest test_vowel_counter.py
+"""
+
+import unittest
+
+from solutions.count_vowels import count_vowels  # Import the count_vowels function
+
+
+class TestCountVowels(unittest.TestCase):
+    """Test cases for the count_vowels function.
+
+    This class contains unit tests for the count_vowels function to ensure
+    that it accurately counts the number of vowels in various input strings.
+    """
+
+    def test_count_vowels_normal(self):
+        """Test counting vowels in a normal string.
+
+        This test checks that the function correctly counts the vowels in a
+        typical string with mixed characters.
+        """
+        self.assertEqual(count_vowels("Nagham"), 2)
+
+    def test_count_vowels_no_vowels(self):
+        """Test counting vowels in a string with no vowels.
+
+        This test checks that the function returns 0 when there are no vowels
+        in the input string.
+        """
+        self.assertEqual(count_vowels("bcdfghjklmnpqrstvwxyz"), 0)
+
+    def test_count_vowels_case_insensitive(self):
+        """Test counting vowels in a case-insensitive manner.
+
+        This test verifies that the function counts both uppercase and lowercase
+        vowels correctly.
+        """
+        self.assertEqual(count_vowels("AbEcIdOfUg"), 5)
+
+    def test_count_vowels_with_spaces(self):
+        """Test counting vowels in a string with spaces.
+
+        This test checks that the function correctly counts vowels in a string
+        that contains spaces and punctuation.
+        """
+        self.assertEqual(count_vowels("Hello World!"), 3)
+
+    # Defensive assertion tests
+    def test_invalid_input_type_integer(self):
+        """Test that the function raises a TypeError for non-string input (integer)."""
+        with self.assertRaises(TypeError):
+            count_vowels(12345)
+
+    def test_invalid_input_type_list(self):
+        """Test that the function raises a TypeError for non-string input (list)."""
+        with self.assertRaises(TypeError):
+            count_vowels(["a", "b", "c"])
+
+    def test_empty_string(self):
+        """Test that the function raises a ValueError for an empty string."""
+        with self.assertRaises(ValueError):
+            count_vowels("")
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/solutions/tests/test_fizz_buzz.py b/solutions/tests/test_fizz_buzz.py
new file mode 100644
index 000000000..ab526fdaf
--- /dev/null
+++ b/solutions/tests/test_fizz_buzz.py
@@ -0,0 +1,77 @@
+"""
+Unit tests for the fizz_buzz function from the solutions.fizz_buzz module.
+
+This class uses the unittest framework to validate the behavior of the fizz_buzz function
+across various input values, ensuring it produces the correct output lists. Tests include
+cases for n = 1, 3, 5, 15, and additional edge cases to comprehensively test the function.
+"""
+
+import unittest
+from solutions.fizz_buzz import fizz_buzz
+
+
+class TestFizzBuzz(unittest.TestCase):
+    """Test cases for the fizz_buzz function.
+
+    This class contains unit tests for the fizz_buzz function to ensure
+    that it produces the expected output for various input values.
+    """
+
+    def test_fizzbuzz_15(self):
+        """Test FizzBuzz for n = 15."""
+        expected = [
+            1, 2, "Fizz", 4, "Buzz", "Fizz", 7, 8, "Fizz",
+            "Buzz", 11, "Fizz", 13, 14, "FizzBuzz"
+        ]
+        self.assertEqual(fizz_buzz(15), expected)
+
+    def test_fizzbuzz_3(self):
+        """Test FizzBuzz for n = 3."""
+        expected = [1, 2, "Fizz"]
+        self.assertEqual(fizz_buzz(3), expected)
+
+    def test_fizzbuzz_5(self):
+        """Test FizzBuzz for n = 5."""
+        expected = [1, 2, "Fizz", 4, "Buzz"]
+        self.assertEqual(fizz_buzz(5), expected)
+
+    def test_fizzbuzz_1(self):
+        """Test FizzBuzz for n = 1."""
+        expected = [1]
+        self.assertEqual(fizz_buzz(1), expected)
+
+    def test_fizzbuzz_zero(self):
+        """Test FizzBuzz for n = 0."""
+        with self.assertRaises(ValueError):
+            fizz_buzz(0)
+
+    def test_fizzbuzz_negative(self):
+        """Test FizzBuzz for negative n."""
+        with self.assertRaises(ValueError):
+            fizz_buzz(-5)
+
+    def test_fizzbuzz_non_integer(self):
+        """Test FizzBuzz for non-integer n."""
+        non_integers = [3.5, "string", None, [], {}, (), 2.0]
+        for value in non_integers:
+            with self.assertRaises(TypeError):
+                fizz_buzz(value)
+
+    def test_fizzbuzz_large_number(self):
+        """Test FizzBuzz for a larger number n = 30."""
+        expected = [
+            1, 2, "Fizz", 4, "Buzz", "Fizz", 7, 8, "Fizz",
+            "Buzz", 11, "Fizz", 13, 14, "FizzBuzz", 16,
+            17, "Fizz", 19, "Buzz", "Fizz", 22, 23, "Fizz",
+            "Buzz", 26, "Fizz", 28, 29, "FizzBuzz"
+        ]
+        self.assertEqual(fizz_buzz(30), expected)
+
+    def test_fizzbuzz_edge_case(self):
+        """Test FizzBuzz for n = 2."""
+        expected = [1, 2]
+        self.assertEqual(fizz_buzz(2), expected)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/solutions/tests/test_reverse_string.py b/solutions/tests/test_reverse_string.py
new file mode 100644
index 000000000..09e038f18
--- /dev/null
+++ b/solutions/tests/test_reverse_string.py
@@ -0,0 +1,78 @@
+"""
+Unit tests for the `reverse_string` function.
+
+This module tests the `reverse_string` function, which reverses an input string.
+It includes various test cases to ensure that the function handles:
+- Normal strings
+- Strings containing numbers
+- Strings with special characters
+- Single characters
+- Palindromes
+- Strings with spaces
+- Extremely long strings
+It also checks that a ValueError is raised for empty strings and that a TypeError is raised for non-string inputs.
+"""
+
+import unittest
+from solutions.reverse_string import reverse_string
+
+
+class TestReverseString(unittest.TestCase):
+    """Test cases for the reverse_string function.
+
+    This class contains unit tests for the reverse_string function to ensure
+    that it correctly reverses strings under various scenarios.
+    """
+
+    def test_reverse_normal(self):
+        """Test reversing a normal string."""
+        self.assertEqual(reverse_string("hello"), "olleh")
+
+    def test_reverse_single_character(self):
+        """Test reversing a single character string."""
+        self.assertEqual(reverse_string("a"), "a")
+
+    def test_reverse_palindrome(self):
+        """Test reversing a palindrome."""
+        self.assertEqual(reverse_string("madam"), "madam")
+
+    def test_reverse_spaces(self):
+        """Test reversing a string with spaces."""
+        self.assertEqual(reverse_string("hello world"), "dlrow olleh")
+
+    def test_numbers_in_string(self):
+        """Test reversing a string containing numbers."""
+        self.assertEqual(reverse_string("12345"), "54321")
+
+    def test_special_characters(self):
+        """Test reversing a string with special characters."""
+        self.assertEqual(reverse_string("!@#$"), "$#@!")
+
+    def test_long_string(self):
+        """Test reversing an extremely long string."""
+        long_string = "a" * 10000
+        self.assertEqual(reverse_string(long_string), long_string[::-1])
+
+    def test_reverse_empty(self):
+        """Test that an empty string raises a ValueError."""
+        with self.assertRaises(ValueError):
+            reverse_string("")  # This input should raise a ValueError
+
+    def test_integer_input(self):
+        """Test that an integer input raises a TypeError."""
+        with self.assertRaises(TypeError):
+            reverse_string(12345)  # Non-string input: integer
+
+    def test_none_input(self):
+        """Test that a None input raises a TypeError."""
+        with self.assertRaises(TypeError):
+            reverse_string(None)  # Non-string input: NoneType
+
+    def test_list_input(self):
+        """Test that a list input raises a TypeError."""
+        with self.assertRaises(TypeError):
+            reverse_string(["a", "b", "c"])  # Non-string input: list
+
+
+if __name__ == "__main__":
+    unittest.main()