Create get_dup_chars.py

Author: Amogh Singhal

Diff for: get_dup_chars.py

@@ -0,0 +1,16 @@
+# Print duplicate characters in a string
+
+def get_dup_chars(input_str):
+  dedupe_str = ''
+  dup_chars = []
+
+  for char in input_str:
+    if char not in dedupe_str:
+      dedupe_str += char
+    else:
+      dup_chars.append(char)
+
+  return dup_chars
+
+result = get_dup_chars("zmaxxazkgv")
+print(result)  # ['x', 'a', 'z']