Refactor code to use Path class

bin/genieacs-ext

@@ -40,13 +40,17 @@ function errorToFault(err: Error): Fault {
   };
 
   if (err.stack) {
-    fault.detail.stack = err.stack;
+    fault.detail["stack"] = err.stack;
     // Trim the stack trace
-    const stackTrimIndex = fault.detail.stack.match(
+    const stackTrimIndex = fault.detail["stack"].match(
       /\s+at\s[^\s]+\s\(.*genieacs-ext:.+\)/
     );
-    if (stackTrimIndex)
-      fault.detail.stack = fault.detail.stack.slice(0, stackTrimIndex.index);
+    if (stackTrimIndex) {
+      fault.detail["stack"] = fault.detail["stack"].slice(
+        0,
+        stackTrimIndex.index
+      );
+    }
   }
 
   return fault;