Removed the unnecessary "fullPath" computed property from the Resource model in the library target.

Sources/HummingbirdDocC/Internal/Extensions/String+Formats.swift

@@ -31,8 +31,6 @@ extension String {
             static let forwardSlash = "%@/"
             /// A format pattern used to generate relative paths for index files.
             static let index = "%@/%@/index.html"
-            /// A format pattern used to generate relative paths for resources.
-            static let resource = "/%@/%@"
             /// A format pattern used to generate relative paths that starts with the `/` string.
             static let root = "/%@"
         }

Sources/HummingbirdDocC/Internal/Extensions/String+Helpers.swift

@@ -37,7 +37,7 @@ extension String {
             return nil
         }
         
-        return matches.output.1
+        return matches.output.1 ?? .empty
     }
     
 }