Implement utility functions for list and dict operations

Week03/sequences_zeynepnur_erten.py

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+def remove_duplicates(seq: list) -> list:
+    unique_list = []
+    for i in seq:
+        if i not in unique_list:
+            unique_list.append(i)
+
+    return unique_list
+
+
+def list_counts(seq: list) -> dict:
+    items = dict()
+    for i in seq:
+        if i not in items:
+            items[i] = 1
+        else:
+            items[i] += 1
+
+    return items
+
+
+def reverse_dict(d: dict) -> dict:
+    reversed_dict = {}
+    for i in d:
+        reversed_dict[d[i]] = i
+
+    return reversed_dict
+
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