Address PR feedback

Author: MaxDesiatov

Sources/Basics/Archiver/UniversalArchiver.swift

@@ -20,7 +20,7 @@ public struct UniversalArchiver: Archiver {
 
     /// Errors specific to the implementation of ``UniversalArchiver``.
     enum Error: Swift.Error {
-        case unknownFormat([Substring], AbsolutePath)
+        case unknownFormat([String], AbsolutePath)
         case noFileNameExtension(AbsolutePath)
 
         var description: String {
@@ -66,7 +66,7 @@ public struct UniversalArchiver: Archiver {
 
         if let archiver = self.formatMapping[extensions.joined(separator: ".")] {
             return archiver
-        } else if let lastExtension = extensions.last, let archiver = self.formatMapping[String(lastExtension)] {
+        } else if let lastExtension = extensions.last, let archiver = self.formatMapping[lastExtension] {
             return archiver
         } else {
             throw Error.unknownFormat(extensions, archivePath)

Sources/Basics/FileSystem/Path+Extensions.swift

@@ -41,7 +41,7 @@ extension AbsolutePath {
 
     /// Unlike ``AbsolutePath//extension``, this property returns all characters after the first `.` character in a
     /// `````. If no dot character is present in the filename or first dot is the last character, `nil` is returned.
-    var allExtensions: [Substring]? {
+    var allExtensions: [String]? {
         guard let firstDot = basename.firstIndex(of: ".") else {
             return nil
         }
@@ -54,6 +54,6 @@ extension AbsolutePath {
 
         extensions.removeFirst()
 
-        return extensions.split(separator: ".")
+        return extensions.split(separator: ".").map(String.init)
     }
 }