Update sequences_mert_can_fidan.py

My Changes
Firstly, I created four values named as my_list, my_tuple, my_set, my_dict and after that I created three functions named as remove_duplicates, list_counts and reverse_dict.

Checklist
 I have read [CONTRIBUTING].
 I have performed a self-review of my own code.
 I have run the code locally and it works as explained.
 I have commented my code, particularly in hard-to-understand areas

Author: usrmertc

Week02/sequences_mert_can_fidan.py

@@ -1,7 +1,7 @@
 my_list = ["Mert", "Can", "Fidan", "Can", "Fidan",24,24,24]
 my_tuple = ("Mert", "Can", "Fidan")
 my_set = {"Mert", "Can", "Fidan"}
-my_dictionary = {
+my_dict = {
   "name": "Mert Can Fidan",
   "age": 24,
   "alive": True