Refactor remove duplicates to more pythonic (TheAlgorithms#2093)

* Refactor strings/remove_duplicate to more pythonic

* updating DIRECTORY.md

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

Author: l3str4nge

DIRECTORY.md

@@ -258,6 +258,10 @@
   * [Scc Kosaraju](https://github.com/TheAlgorithms/Python/blob/master/graphs/scc_kosaraju.py)
   * [Tarjans Scc](https://github.com/TheAlgorithms/Python/blob/master/graphs/tarjans_scc.py)
 
+## Greedy Method
+  * [Greedy Knapsack](https://github.com/TheAlgorithms/Python/blob/master/greedy_method/greedy_knapsack.py)
+  * [Test Knapsack](https://github.com/TheAlgorithms/Python/blob/master/greedy_method/test_knapsack.py)
+
 ## Hashes
   * [Chaos Machine](https://github.com/TheAlgorithms/Python/blob/master/hashes/chaos_machine.py)
   * [Enigma Machine](https://github.com/TheAlgorithms/Python/blob/master/hashes/enigma_machine.py)

strings/remove_duplicate.py

@@ -1,4 +1,4 @@
-# Created by sarathkaul on 14/11/19
+""" Created by sarathkaul on 14/11/19 """
 
 
 def remove_duplicates(sentence: str) -> str:
@@ -7,13 +7,7 @@ def remove_duplicates(sentence: str) -> str:
     >>> remove_duplicates("Python is great and Java is also great")
     'Java Python also and great is'
     """
-    sen_list = sentence.split(" ")
-    check = set()
-
-    for a_word in sen_list:
-        check.add(a_word)
-
-    return " ".join(sorted(check))
+    return " ".join(sorted(set(sentence.split(" "))))
 
 
 if __name__ == "__main__":