diff --git a/DIRECTORY.md b/DIRECTORY.md
index a70ad6861..fc6cbaf7f 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -294,7 +294,6 @@
   * [Mergesort](divide_and_conquer/mergesort.py)
   * [Peak](divide_and_conquer/peak.py)
   * [Power](divide_and_conquer/power.py)
-  * [Strassen Matrix Multiplication](divide_and_conquer/strassen_matrix_multiplication.py)
 
 ## Dynamic Programming
   * [Abbreviation](dynamic_programming/abbreviation.py)
@@ -632,6 +631,7 @@
   * [Radians](maths/radians.py)
   * [Radix2 Fft](maths/radix2_fft.py)
   * [Relu](maths/relu.py)
+  * [Remove Digit](maths/remove_digit.py)
   * [Runge Kutta](maths/runge_kutta.py)
   * [Segmented Sieve](maths/segmented_sieve.py)
   * Series
@@ -694,6 +694,8 @@
 
 ## Neural Network
   * [2 Hidden Layers Neural Network](neural_network/2_hidden_layers_neural_network.py)
+  * Activation Functions
+    * [Exponential Linear Unit](neural_network/activation_functions/exponential_linear_unit.py)
   * [Back Propagation Neural Network](neural_network/back_propagation_neural_network.py)
   * [Convolution Neural Network](neural_network/convolution_neural_network.py)
   * [Input Data](neural_network/input_data.py)
@@ -1080,6 +1082,7 @@
 
 ## Sorts
   * [Bead Sort](sorts/bead_sort.py)
+  * [Binary Insertion Sort](sorts/binary_insertion_sort.py)
   * [Bitonic Sort](sorts/bitonic_sort.py)
   * [Bogo Sort](sorts/bogo_sort.py)
   * [Bubble Sort](sorts/bubble_sort.py)
@@ -1170,6 +1173,7 @@
   * [Reverse Words](strings/reverse_words.py)
   * [Snake Case To Camel Pascal Case](strings/snake_case_to_camel_pascal_case.py)
   * [Split](strings/split.py)
+  * [String Switch Case](strings/string_switch_case.py)
   * [Text Justification](strings/text_justification.py)
   * [Top K Frequent Words](strings/top_k_frequent_words.py)
   * [Upper](strings/upper.py)
diff --git a/conversions/prefix_conversions_string.py b/conversions/prefix_conversions_string.py
index 3851d7c8b..9344c9672 100644
--- a/conversions/prefix_conversions_string.py
+++ b/conversions/prefix_conversions_string.py
@@ -96,7 +96,7 @@ def add_si_prefix(value: float) -> str:
     for name_prefix, value_prefix in prefixes.items():
         numerical_part = value / (10**value_prefix)
         if numerical_part > 1:
-            return f"{str(numerical_part)} {name_prefix}"
+            return f"{numerical_part!s} {name_prefix}"
     return str(value)
 
 
@@ -111,7 +111,7 @@ def add_binary_prefix(value: float) -> str:
     for prefix in BinaryUnit:
         numerical_part = value / (2**prefix.value)
         if numerical_part > 1:
-            return f"{str(numerical_part)} {prefix.name}"
+            return f"{numerical_part!s} {prefix.name}"
     return str(value)
 
 
diff --git a/conversions/rgb_hsv_conversion.py b/conversions/rgb_hsv_conversion.py
index 081cfe1d7..74b3d33e4 100644
--- a/conversions/rgb_hsv_conversion.py
+++ b/conversions/rgb_hsv_conversion.py
@@ -121,8 +121,8 @@ def rgb_to_hsv(red: int, green: int, blue: int) -> list[float]:
     float_red = red / 255
     float_green = green / 255
     float_blue = blue / 255
-    value = max(max(float_red, float_green), float_blue)
-    chroma = value - min(min(float_red, float_green), float_blue)
+    value = max(float_red, float_green, float_blue)
+    chroma = value - min(float_red, float_green, float_blue)
     saturation = 0 if value == 0 else chroma / value
 
     if chroma == 0:
diff --git a/digital_image_processing/test_digital_image_processing.py b/digital_image_processing/test_digital_image_processing.py
index c999464ce..fee7ab247 100644
--- a/digital_image_processing/test_digital_image_processing.py
+++ b/digital_image_processing/test_digital_image_processing.py
@@ -96,7 +96,7 @@ def test_nearest_neighbour(
 
 
 def test_local_binary_pattern():
-    file_path: str = "digital_image_processing/image_data/lena.jpg"
+    file_path = "digital_image_processing/image_data/lena.jpg"
 
     # Reading the image and converting it to grayscale.
     image = imread(file_path, 0)
diff --git a/divide_and_conquer/strassen_matrix_multiplication.py b/divide_and_conquer/strassen_matrix_multiplication.py.BROKEN
similarity index 99%
rename from divide_and_conquer/strassen_matrix_multiplication.py
rename to divide_and_conquer/strassen_matrix_multiplication.py.BROKEN
index 371605d6d..2ca91c63b 100644
--- a/divide_and_conquer/strassen_matrix_multiplication.py
+++ b/divide_and_conquer/strassen_matrix_multiplication.py.BROKEN
@@ -122,7 +122,7 @@ def strassen(matrix1: list, matrix2: list) -> list:
     if dimension1[0] == dimension1[1] and dimension2[0] == dimension2[1]:
         return [matrix1, matrix2]
 
-    maximum = max(max(dimension1), max(dimension2))
+    maximum = max(dimension1, dimension2)
     maxim = int(math.pow(2, math.ceil(math.log2(maximum))))
     new_matrix1 = matrix1
     new_matrix2 = matrix2
diff --git a/dynamic_programming/fibonacci.py b/dynamic_programming/fibonacci.py
index 7ec5993ef..c102493aa 100644
--- a/dynamic_programming/fibonacci.py
+++ b/dynamic_programming/fibonacci.py
@@ -24,7 +24,7 @@ class Fibonacci:
         return self.sequence[:index]
 
 
-def main():
+def main() -> None:
     print(
         "Fibonacci Series Using Dynamic Programming\n",
         "Enter the index of the Fibonacci number you want to calculate ",
diff --git a/maths/euclidean_distance.py b/maths/euclidean_distance.py
index 22012e92c..9b29b37b0 100644
--- a/maths/euclidean_distance.py
+++ b/maths/euclidean_distance.py
@@ -1,12 +1,12 @@
 from __future__ import annotations
 
+import typing
 from collections.abc import Iterable
-from typing import Union
 
 import numpy as np
 
-Vector = Union[Iterable[float], Iterable[int], np.ndarray]
-VectorOut = Union[np.float64, int, float]
+Vector = typing.Union[Iterable[float], Iterable[int], np.ndarray]  # noqa: UP007
+VectorOut = typing.Union[np.float64, int, float]  # noqa: UP007
 
 
 def euclidean_distance(vector_1: Vector, vector_2: Vector) -> VectorOut:
diff --git a/physics/horizontal_projectile_motion.py b/physics/horizontal_projectile_motion.py
index dbde3660f..80f85a1b7 100644
--- a/physics/horizontal_projectile_motion.py
+++ b/physics/horizontal_projectile_motion.py
@@ -147,6 +147,6 @@ if __name__ == "__main__":
     # Print results
     print()
     print("Results: ")
-    print(f"Horizontal Distance: {str(horizontal_distance(init_vel, angle))} [m]")
-    print(f"Maximum Height: {str(max_height(init_vel, angle))} [m]")
-    print(f"Total Time: {str(total_time(init_vel, angle))} [s]")
+    print(f"Horizontal Distance: {horizontal_distance(init_vel, angle)!s} [m]")
+    print(f"Maximum Height: {max_height(init_vel, angle)!s} [m]")
+    print(f"Total Time: {total_time(init_vel, angle)!s} [s]")
diff --git a/searches/binary_tree_traversal.py b/searches/binary_tree_traversal.py
index 76e80df25..6fb841af4 100644
--- a/searches/binary_tree_traversal.py
+++ b/searches/binary_tree_traversal.py
@@ -13,11 +13,9 @@ class TreeNode:
         self.left = None
 
 
-def build_tree():
+def build_tree() -> TreeNode:
     print("\n********Press N to stop entering at any point of time********\n")
-    check = input("Enter the value of the root node: ").strip().lower() or "n"
-    if check == "n":
-        return None
+    check = input("Enter the value of the root node: ").strip().lower()
     q: queue.Queue = queue.Queue()
     tree_node = TreeNode(int(check))
     q.put(tree_node)
@@ -37,7 +35,7 @@ def build_tree():
         right_node = TreeNode(int(check))
         node_found.right = right_node
         q.put(right_node)
-    return None
+    raise
 
 
 def pre_order(node: TreeNode) -> None:
@@ -272,7 +270,7 @@ if __name__ == "__main__":
     doctest.testmod()
     print(prompt("Binary Tree Traversals"))
 
-    node = build_tree()
+    node: TreeNode = build_tree()
     print(prompt("Pre Order Traversal"))
     pre_order(node)
     print(prompt() + "\n")