primeiro commit com exercicios de Exercism realizados até esta data

python/atbash-cipher/atbash_cipher.py

@@ -0,0 +1,30 @@
+def encode(plain_text: str) -> str:
+    encoded_text: str = ""
+    weight: int = 0
+    for char in plain_text.lower():
+        if char.isalpha():
+            encoded_text += chr(97 + 25 - (ord(char) - 97))
+            weight += 1
+        elif char.isdigit():
+            encoded_text += char
+            weight += 1
+        else:
+            continue
+        if (weight % 5) == 0:
+            encoded_text += " "
+    # remove space at the end when it exists
+    if encoded_text[-1] == " ":
+        return encoded_text[0:-1]
+    return encoded_text
+
+
+def decode(ciphered_text: str) -> str:
+    decoded_text: str = ""
+    for char in ciphered_text.lower():
+        if char.isalpha():
+            decoded_text += chr(122 - 25 + (122 - ord(char)))
+        elif char.isdigit():
+            decoded_text += char
+        else:
+            continue
+    return decoded_text