added for loop method to encode and decode

NeetCodeRoadmap/Arrays_and_Hashing/Encode_Decode_Strings.py

@@ -1,9 +1,14 @@
-def encode(self, strs):
+def encode(strs):
     # write your code here
+    key = []
+    encode = []
+    for x in strs:
+        if x in key:
+            encode.append(x)
 
 """
 @param: str: A string
 @return: decodes a single string to a list of strings
 """
-def decode(self, str):
+def decode(str):
     # write your code here