chore: update tree (#2371)

Co-authored-by: Bo-Yi Wu <appleboy.tw@gmail.com>

tree.go

@@ -119,7 +119,6 @@ func (n *node) incrementChildPrio(pos int) int {
 	for ; newPos > 0 && cs[newPos-1].priority < prio; newPos-- {
 		// Swap node positions
 		cs[newPos-1], cs[newPos] = cs[newPos], cs[newPos-1]
-
 	}
 
 	// Build new index char string
@@ -559,8 +558,8 @@ func (n *node) findCaseInsensitivePath(path string, fixTrailingSlash bool) ([]by
 	// Use a static sized buffer on the stack in the common case.
 	// If the path is too long, allocate a buffer on the heap instead.
 	buf := make([]byte, 0, stackBufSize)
-	if l := len(path) + 1; l > stackBufSize {
+	if length := len(path) + 1; length > stackBufSize {
-		buf = make([]byte, 0, l)
+		buf = make([]byte, 0, length)
 	}
 
 	ciPath := n.findCaseInsensitivePathRec(
@@ -600,7 +599,30 @@ walk: // Outer loop for walking the tree
 		path = path[npLen:]
 		ciPath = append(ciPath, n.path...)
 
-		if len(path) > 0 {
+		if len(path) == 0 {
+			// We should have reached the node containing the handle.
+			// Check if this node has a handle registered.
+			if n.handlers != nil {
+				return ciPath
+			}
+
+			// No handle found.
+			// Try to fix the path by adding a trailing slash
+			if fixTrailingSlash {
+				for i, c := range []byte(n.indices) {
+					if c == '/' {
+						n = n.children[i]
+						if (len(n.path) == 1 && n.handlers != nil) ||
+							(n.nType == catchAll && n.children[0].handlers != nil) {
+							return append(ciPath, '/')
+						}
+						return nil
+					}
+				}
+			}
+			return nil
+		}
+
 		// If this node does not have a wildcard (param or catchAll) child,
 		// we can just look up the next child node and continue to walk down
 		// the tree
@@ -735,29 +757,6 @@ walk: // Outer loop for walking the tree
 		default:
 			panic("invalid node type")
 		}
-		} else {
-			// We should have reached the node containing the handle.
-			// Check if this node has a handle registered.
-			if n.handlers != nil {
-				return ciPath
-			}
-
-			// No handle found.
-			// Try to fix the path by adding a trailing slash
-			if fixTrailingSlash {
-				for i, c := range []byte(n.indices) {
-					if c == '/' {
-						n = n.children[i]
-						if (len(n.path) == 1 && n.handlers != nil) ||
-							(n.nType == catchAll && n.children[0].handlers != nil) {
-							return append(ciPath, '/')
-						}
-						return nil
-					}
-				}
-			}
-			return nil
-		}
 	}
 
 	// Nothing found.