Improve implementation

src/Base32/Base32.php

@@ -7,6 +7,18 @@
 use RuntimeException;
 use ValueError;
 
+use function array_key_exists;
+use function chr;
+use function rtrim;
+use function str_replace;
+use function str_split;
+use function strcspn;
+use function strlen;
+use function strpos;
+use function strtoupper;
+use function substr;
+use function unpack;
+
 final class Base32
 {
     private const ALPHABET_SIZE = 32;
@@ -125,9 +137,12 @@ public function decode(string $encoded, bool $strict = false): string
                 throw new RuntimeException('The encoded data length is invalid.');
             }
 
+            $remainderStr = '';
             for ($index = 0; $index < $remainder; $index++) {
-                $encoded .= $padding;
+                $remainderStr .= $padding;
             }
+
+            $encoded .= $remainderStr;
         }
 
         $chars = [];