diff --git a/solutions/count_words.py b/solutions/count_words.py
new file mode 100644
index 000000000..c2ef107ca
--- /dev/null
+++ b/solutions/count_words.py
@@ -0,0 +1,35 @@
+"""
+A module for counting words in a string.
+
+Module contents:
+    - count_words: counts the number of words in a string.
+
+Created on 01 01 2025
+@author: Raghad
+"""
+
+
+def count_words(text: str) -> int:
+    """Count the number of words in a given string.
+
+    Parameters:
+        text: str, the input string to analyze
+
+    Returns -> int: number of words in the text
+
+    Raises:
+        AssertionError: if the argument is not a string
+
+    >>> count_words("Hello World")
+    2
+    >>> count_words("Python programming is fun")
+    4
+    >>> count_words("")
+    0
+    """
+    # Validate input
+    assert isinstance(text, str), "Input must be a string"
+
+    # Split the text by whitespace and count the resulting parts
+    words = text.split()
+    return len(words)
diff --git a/solutions/decimal_to_binary.py b/solutions/decimal_to_binary.py
new file mode 100644
index 000000000..ba2f9e08e
--- /dev/null
+++ b/solutions/decimal_to_binary.py
@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+A function to convert decimal numbers to binary.
+
+Created on 1/1/2025
+@author: Heba Shaheen
+"""
+
+
+def decimal_to_binary(decimal_input: int) -> str:
+    """Give the binary number for a decimal
+
+    Args:
+        decimal_input (int): Decimal number to be converted
+
+    Returns:
+        str: Binary representation of the decimal number
+
+    Raises:
+        AssertionError: if the input is not an integer
+
+    >>> decimal_to_binary(10)
+    "1010"
+
+    >>> decimal_to_binary(20)
+    "10100"
+
+    >>> decimal_to_binary(255)
+    "11111111"
+    """
+    # Handle the edge case for 0
+    assert isinstance(decimal_input, int), "The input should be integer"
+    assert decimal_input >= 0, "Give a positive input"
+    if decimal_input == 0:
+        return "0"
+    binary = ""
+    while decimal_input > 0:
+        binary = str(decimal_input % 2) + binary
+        decimal_input //= 2
+    return binary
diff --git a/solutions/is_palindrome.py b/solutions/is_palindrome.py
new file mode 100644
index 000000000..61ee8e2de
--- /dev/null
+++ b/solutions/is_palindrome.py
@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+A module for checking if a given string is a palindrome (reads the same backward as forward)
+
+Module contents:
+    - palindrome: input string is palindrome if it reads the same backward as forward
+
+Created on 30.12.2024
+@author: Saad M. Ashour
+"""
+
+
+def is_palindrome(input_string: str) -> bool:
+    """
+    Check if a given string is a palindrome.
+
+    A palindrome is a word, phrase, number, or other sequence of characters
+    that reads the same forward and backward, ignoring spaces, punctuation,
+    and case sensitivity.
+
+    Parameters:
+        input_string (str): The input string to be checked.
+
+    Returns:
+        bool: True if the input string is a palindrome, False otherwise.
+
+    Examples:
+        >>> is_palindrome("A man, a plan, a canal, Panama")
+        True
+        >>> is_palindrome("hello")
+        False
+        >>> is_palindrome("Madam")
+        True
+    """
+    # AssertionError: Input must be a string
+    assert isinstance(input_string, str), "Input must be a string"
+
+    # Remove non-alphanumeric characters and convert to lowercase
+    cleaned = "".join(char.lower() for char in input_string if char.isalnum())
+
+    # Check if the cleaned string is equal to its reverse
+    return cleaned == cleaned[::-1]
diff --git a/solutions/remove_duplicates.py b/solutions/remove_duplicates.py
new file mode 100644
index 000000000..3b72fd373
--- /dev/null
+++ b/solutions/remove_duplicates.py
@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+A Function for removing the duplicates items in a list.
+
+Created on 2024-12-30
+Author: Heba Shaheen
+"""
+
+
+def remove_duplicates(nums: list) -> list:
+    """
+    Given a list, return a new list without any repeated values.
+    The function goes item by item; if an item is not in the result list,
+    it appends it; otherwise, it skips it.
+
+    Args:
+        nums (list): The list from which duplicates will be removed.
+
+    Returns:
+        list: A list without duplicates.
+    Raises:
+        AssertionError: If the input not a list.
+
+    >>> remove_duplicates([2, 4, 2, 5, 5, 7, 2, 6])
+    [2, 4, 5, 7, 6]
+
+    >>> remove_duplicates(["a", "v", "e", "e", "q", "v", "q", "a"])
+    ['a', 'v', 'e', 'q']
+
+    >>> remove_duplicates(["Heba", "Noor", "Heba", "Noor"])
+    ['Heba', 'Noor']
+    """
+    assert isinstance(nums, list), "The input should be a list"
+    result = []  # List to store the result without duplicates
+
+    for num in nums:
+        if num not in result:
+            result.append(num)  # Add the number to the result list
+    return result
diff --git a/solutions/tests/test_count_words b/solutions/tests/test_count_words
new file mode 100644
index 000000000..1429ea00c
--- /dev/null
+++ b/solutions/tests/test_count_words
@@ -0,0 +1,42 @@
+"""
+A module for testing count_words.py
+
+Module contents:
+    - Unit Test cases for function count_words
+
+Created on 01 01 2025
+@author: Raghad
+"""
+
+import unittest
+from solutions.count_words import count_words
+
+
+class TestCountWords(unittest.TestCase):
+    def test_empty_string(self):
+        """Test with an empty string"""
+        self.assertEqual(count_words(""), 0)
+
+    def test_single_word(self):
+        """Test with a single word"""
+        self.assertEqual(count_words("hello"), 1)
+
+    def test_multiple_words(self):
+        """Test with multiple words"""
+        self.assertEqual(count_words("Hello, world!"), 2)
+
+    def test_extra_spaces(self):
+        """Test with extra spaces"""
+        self.assertEqual(count_words("   Hello   world   "), 2)
+
+    def test_numbers_and_words(self):
+        """Test with a mix of numbers and words"""
+        self.assertEqual(count_words("123 hello 456 world"), 4)
+
+    def test_special_characters(self):
+        """Test with special characters"""
+        self.assertEqual(count_words("!@# $%^ &*()"), 3)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/solutions/tests/test_decimal_to_binary.py b/solutions/tests/test_decimal_to_binary.py
new file mode 100644
index 000000000..a2635e9b6
--- /dev/null
+++ b/solutions/tests/test_decimal_to_binary.py
@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Unit tests for decimal_to_binary function.
+
+@author: Heba Shaheen
+"""
+
+import unittest
+
+from ..decimal_to_binary import decimal_to_binary
+
+
+class TestDecimalToBinary(unittest.TestCase):
+    """Unit tests for decimal_to_binary function."""
+
+    def test_number_0(self):
+        """It should return "0" as binary"""
+        actual = decimal_to_binary(0)
+        expected = "0"
+        self.assertEqual(actual, expected)
+
+    def test_number_2(self):
+        """It should return "10" as binary"""
+        actual = decimal_to_binary(2)
+        expected = "10"
+        self.assertEqual(actual, expected)
+
+    def test_number_5(self):
+        """It should return "101" as binary"""
+        actual = decimal_to_binary(5)
+        expected = "101"
+        self.assertEqual(actual, expected)
+
+    def test_number_15(self):
+        """It should return "1111" as binary"""
+        actual = decimal_to_binary(15)
+        expected = "1111"
+        self.assertEqual(actual, expected)
+
+    def test_non_integer_input(self):
+        """It should raise an assertion error if the argument is not an integer"""
+        with self.assertRaises(AssertionError):
+            decimal_to_binary("1")
+
+    def test_negative_input(self):
+        """It should raise an assertion error if the argument is negative"""
+        with self.assertRaises(AssertionError):
+            decimal_to_binary(-3)
diff --git a/solutions/tests/test_is_palindrome.py b/solutions/tests/test_is_palindrome.py
new file mode 100644
index 000000000..1f1c8d4b8
--- /dev/null
+++ b/solutions/tests/test_is_palindrome.py
@@ -0,0 +1,61 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Unit tests for is_palindrome function.
+
+@author: Saad M. Ashour
+"""
+
+import unittest
+
+from ..is_palindrome import is_palindrome
+
+
+class TestIsPalindrome(unittest.TestCase):
+    """
+    Unit tests for the is_palindrome function.
+
+    These tests check various cases to ensure that the is_palindrome function correctly
+    identifies palindromes, considering case insensitivity, non-alphanumeric characters,
+    and other edge cases.
+    """
+
+    def test_palindrome(self):
+        """
+        Test cases where the string is a palindrome.
+        """
+        actual = is_palindrome("A man, a plan, a canal, Panama")
+        self.assertTrue(actual)
+
+    def test_non_palindrome(self):
+        """
+        Test cases where the string is not a palindrome.
+        """
+        actual = is_palindrome("hello")
+        self.assertFalse(actual)
+
+    def test_empty_string(self):
+        """
+        Test case where the input is an empty string, which is considered a palindrome.
+        """
+        actual = is_palindrome("")
+        self.assertTrue(actual)
+
+    def test_single_character(self):
+        """
+        Test case where the input is a single character, which is always a palindrome.
+        """
+        actual = is_palindrome("a")
+        self.assertTrue(actual)
+
+    def test_only_non_alphanumeric(self):
+        """
+        Test case where the input contains only non-alphanumeric characters.
+        The function should ignore them and return True for empty string.
+        """
+        actual = is_palindrome("!@#$$@!")
+        self.assertTrue(actual)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/solutions/tests/test_remove_duplicates.py b/solutions/tests/test_remove_duplicates.py
new file mode 100644
index 000000000..33bcd99e4
--- /dev/null
+++ b/solutions/tests/test_remove_duplicates.py
@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Test module for remove_duplicates function.
+
+Created on 2024-12-30
+Author: Heba Shaheen
+"""
+
+import unittest
+
+from ..remove_duplicates import remove_duplicates
+
+
+class TestRemoveDuplicates(unittest.TestCase):
+    """Test remove_duplicates function"""
+
+    # Standard test cases
+    def test_numbers_list(self):
+        """It should remove duplicates numbers"""
+        self.assertEqual(remove_duplicates([1, 2, 3, 2, 3, 4]), [1, 2, 3, 4])
+
+    def test_letters_list(self):
+        """It should remove duplicates letters"""
+        self.assertEqual(
+            remove_duplicates(["a", "v", "e", "e", "q"]), ["a", "v", "e", "q"]
+        )
+
+    def test_mix_list(self):
+        """It should remove duplicates items"""
+        self.assertEqual(
+            remove_duplicates([1, 2, 3, "e", 2, 1, "e", 5, "a"]), [1, 2, 3, "e", 5, "a"]
+        )
+
+    # Edge cases
+    def test_empty_list(self):
+        """It should return empty list"""
+        self.assertEqual(remove_duplicates([]), [])
+
+    # Defensive tests
+    def test_invalid_type(self):
+        """It should raise AssertionError if numbers is not a list"""
+        with self.assertRaises(AssertionError):
+            remove_duplicates("1, 2, 2")
+
+
+if __name__ == "__main__":
+    unittest.main()