updating DIRECTORY.md

Author: idrisibrahimerten

DIRECTORY.md

@@ -757,6 +757,7 @@
     * [Harmonic Series](maths/series/harmonic_series.py)
     * [Hexagonal Numbers](maths/series/hexagonal_numbers.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)
@@ -793,6 +794,7 @@
   * [Tanh](maths/tanh.py)
   * [Test Factorial](maths/test_factorial.py)
   * [Test Prime Check](maths/test_prime_check.py)
+  * [Test Sieve Of Atkin](maths/test_sieve_of_atkin.py)
   * [Three Sum](maths/three_sum.py)
   * [Trapezoidal Rule](maths/trapezoidal_rule.py)
   * [Triplet Sum](maths/triplet_sum.py)
@@ -1352,6 +1354,7 @@
   * [Split](strings/split.py)
   * [String Switch Case](strings/string_switch_case.py)
   * [Strip](strings/strip.py)
+  * [Suffix Array](strings/suffix_array.py)
   * [Text Justification](strings/text_justification.py)
   * [Title](strings/title.py)
   * [Top K Frequent Words](strings/top_k_frequent_words.py)