Extract Digest extension to separate file

Sources/Generator/Extensions/Digest+Extension.swift

@@ -0,0 +1,13 @@
+import Foundation
+import CryptoKit
+
+extension Digest {
+
+    var bytes: [UInt8] { Array(makeIterator()) }
+
+    var data: Data { Data(bytes) }
+
+    var hexStr: String {
+        bytes.map { String(format: "%02X", $0) }.joined()
+    }
+}

Sources/Generator/Files/FileSystem.swift

@@ -632,14 +632,3 @@ final class FileSystem {
         return output
     }
 }
-
-private extension Digest {
-
-    var bytes: [UInt8] { Array(makeIterator()) }
-
-    var data: Data { Data(bytes) }
-
-    var hexStr: String {
-        bytes.map { String(format: "%02X", $0) }.joined()
-    }
-}