Implemented (a first version of) the DocCMiddleware middleware in the library target.

Library/Sources/Internal/Extensions/Path+Functions.swift

@@ -0,0 +1,41 @@
+enum Path {
+    
+    // MARK: Functions
+    
+    static func archiveName(from path: String) -> String {
+        let pathComponents = path.split(separator: .forwardSlash)
+        
+        return pathComponents.count > 1
+            ? String(pathComponents[1]).lowercased()
+            : .empty
+    }
+    
+    static func resourcePath(from path: String) -> String {
+        let matches = path.matches(of: /\//)
+        
+        return matches.count > 2
+            ? .init(path[matches[2].startIndex...])
+            : .forwardSlash
+    }
+    
+}
+
+// MARK: - String+Constants
+
+extension String {
+    static let empty = ""
+    static let forwardSlash = "/"
+    static let previousFolder = ".."
+}
+
+// MARK: - Character+Constants
+
+private extension Character {
+    static let forwardSlash: Character = "/"
+}
+
+// MARK: - String+Formats
+
+private extension String.Format {
+    static let archiveDocC = "%@.doccarchive"
+}