diff --git a/backend/utils/encoding.py b/backend/utils/encoding.py
index 3039fbf..ef10989 100644
--- a/backend/utils/encoding.py
+++ b/backend/utils/encoding.py
@@ -1,7 +1,9 @@
 from typing import Dict
 
 # Таблица Base64-подобного варианта
-VariantBase64Table: str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
+VariantBase64Table: str = (
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
+)
 VariantBase64Dict: Dict[int, str] = {
     i: VariantBase64Table[i] for i in range(len(VariantBase64Table))
 }
@@ -28,7 +30,8 @@ def variant_base64_encode(bs: bytes) -> bytes:
         b: bytes = bs[3*i:3*i+3]
         coding_int: int = int.from_bytes(b, "little")
         block: str = "".join(
-            VariantBase64Dict[(coding_int >> shift) & 0x3F] for shift in (0, 6, 12, 18)
+            VariantBase64Dict[(coding_int >> shift) & 0x3F]
+            for shift in (0, 6, 12, 18)
         )
         result.extend(block.encode("ascii"))
 
@@ -38,7 +41,7 @@ def variant_base64_encode(bs: bytes) -> bytes:
         coding_int: int = int.from_bytes(b, "little")
         block: str = "".join(
             VariantBase64Dict[(coding_int >> shift) & 0x3F]
-            for shift in range(0, left_bytes*8 + 1, 6)
+            for shift in range(0, left_bytes * 8 + 1, 6)
         )
         result.extend(block.encode("ascii"))