diff --git a/DIRECTORY.md b/DIRECTORY.md
index cbbed67b5456..b6abdae03ddd 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -87,6 +87,7 @@
   * [Count 1S Brian Kernighan Method](bit_manipulation/count_1s_brian_kernighan_method.py)
   * [Count Number Of One Bits](bit_manipulation/count_number_of_one_bits.py)
   * [Excess 3 Code](bit_manipulation/excess_3_code.py)
+  * [Fast Walsh Hadamard Transform](bit_manipulation/fast_walsh_hadamard_transform.py)
   * [Find Previous Power Of Two](bit_manipulation/find_previous_power_of_two.py)
   * [Find Unique Number](bit_manipulation/find_unique_number.py)
   * [Gray Code Sequence](bit_manipulation/gray_code_sequence.py)
@@ -765,6 +766,7 @@
   * [Juggler Sequence](maths/juggler_sequence.py)
   * [Karatsuba](maths/karatsuba.py)
   * [Kth Lexicographic Permutation](maths/kth_lexicographic_permutation.py)
+  * [Laplace Transformation](maths/laplace_transformation.py)
   * [Largest Of Very Large Numbers](maths/largest_of_very_large_numbers.py)
   * [Least Common Multiple](maths/least_common_multiple.py)
   * [Line Intersection](maths/line_intersection.py)
@@ -787,6 +789,7 @@
     * [Adams Bashforth](maths/numerical_analysis/adams_bashforth.py)
     * [Bisection](maths/numerical_analysis/bisection.py)
     * [Bisection 2](maths/numerical_analysis/bisection_2.py)
+    * [Brent Method](maths/numerical_analysis/brent_method.py)
     * [Integration By Simpson Approx](maths/numerical_analysis/integration_by_simpson_approx.py)
     * [Intersection](maths/numerical_analysis/intersection.py)
     * [Nevilles Method](maths/numerical_analysis/nevilles_method.py)
@@ -838,6 +841,7 @@
     * [Hexagonal Numbers](maths/series/hexagonal_numbers.py)
     * [Logarithmic Series](maths/series/logarithmic_series.py)
     * [P Series](maths/series/p_series.py)
+  * [Sieve Of Atkin](maths/sieve_of_atkin.py)
   * [Sieve Of Eratosthenes](maths/sieve_of_eratosthenes.py)
   * [Sigmoid](maths/sigmoid.py)
   * [Signum](maths/signum.py)
diff --git a/strings/lower.py b/strings/lower.py
index d66dcd3b7a4e..61b37af4d895 100644
--- a/strings/lower.py
+++ b/strings/lower.py
@@ -18,15 +18,16 @@ def lower(word: str) -> str:
     >>> lower("whAT")
     'what'
     """
-    result = []
-
-    for char in word:
-        code = ord(char)
-        if ASCII_UPPERCASE_START <= code <= ASCII_UPPERCASE_END:
-            char = chr(code + ASCII_CASE_OFFSET)
-        result.append(char)
-
-    return "".join(result)
+    start = ASCII_UPPERCASE_START
+    end = ASCII_UPPERCASE_END
+    offset = ASCII_CASE_OFFSET
+
+    return "".join(
+        [
+            chr(code + offset) if start <= (code := ord(char)) <= end else char
+            for char in word
+        ]
+    )
 
 
 if __name__ == "__main__":