Update encoding_and_decoding.py

kyu_3/rail_fence_cipher_encoding_and_decoding/encoding_and_decoding.py:10 in public function `get_rails`:
        D202: No blank lines allowed after function docstring (found 1)

        There's no blank line either before or after the docstring unless directly
        followed by an inner function or class.

kyu_3/rail_fence_cipher_encoding_and_decoding/encoding_and_decoding.py

@@ -9,7 +9,6 @@
 def get_rails(string: str, n: int) -> list:
     """
     Create rails matrix.
-
     :param string: str
     :param n: int, the number of rails
     :return: list, rails matrix
@@ -23,7 +22,7 @@ def get_rails(string: str, n: int) -> list:
     down = True
     for char in string:
 
-        for char_index in range(0, n):
+        for char_index in range(n):
             if char_index != row:
                 rails[char_index].append("")
             else: