Fixed incorrect path traversal

README.md

@@ -45,6 +45,7 @@ data := router.LookupNoAlloc("GET", "/users/42", func(key string, value string)
 ```
 PASS: TestStatic
 PASS: TestParameter
+PASS: TestMixed
 PASS: TestWildcard
 PASS: TestMap
 PASS: TestMethods

Router_test.go

@@ -72,6 +72,32 @@ func TestParameter(t *testing.T) {
 	assert.Equal(t, data, "Comment")
 }
 
+func TestMixed(t *testing.T) {
+	r := router.New[string]()
+	r.Add("GET", "/", "Frontpage")
+	r.Add("GET", "/blog", "Blog")
+	r.Add("GET", "/:post", "Post")
+	r.Add("GET", "/sitemap.txt", "Sitemap")
+
+	data, params := r.Lookup("GET", "/")
+	assert.Equal(t, len(params), 0)
+	assert.Equal(t, data, "Frontpage")
+
+	data, params = r.Lookup("GET", "/blog")
+	assert.Equal(t, len(params), 0)
+	assert.Equal(t, data, "Blog")
+
+	data, params = r.Lookup("GET", "/software")
+	assert.Equal(t, len(params), 1)
+	assert.Equal(t, params[0].Key, "post")
+	assert.Equal(t, params[0].Value, "software")
+	assert.Equal(t, data, "Post")
+
+	data, params = r.Lookup("GET", "/sitemap.txt")
+	assert.Equal(t, len(params), 0)
+	assert.Equal(t, data, "Sitemap")
+}
+
 func TestWildcard(t *testing.T) {
 	r := router.New[string]()
 	r.Add("GET", "/", "Frontpage")

Tree.go

@@ -93,7 +93,9 @@ func (tree *Tree[T]) Lookup(path string) (T, []Parameter) {
 func (tree *Tree[T]) LookupNoAlloc(path string, addParameter func(key string, value string)) T {
 	var (
 		i             uint
+		parameterPath string
 		wildcardPath  string
+		parameter     *treeNode[T]
 		wildcard      *treeNode[T]
 		node          = &tree.root
 	)
@@ -115,6 +117,8 @@ begin:
 				wildcardPath = path[i:]
 			}
 
+			parameter = node.parameter
+			parameterPath = path[i:]
 			char := path[i]
 
 			if char >= node.startIndex && char < node.endIndex {
@@ -178,6 +182,11 @@ begin:
 	// node: /|*any
 	// path: /|image.png
 notFound:
+	if parameter != nil {
+		addParameter(parameter.prefix, parameterPath)
+		return parameter.data
+	}
+
 	if wildcard != nil {
 		addParameter(wildcard.prefix, wildcardPath)
 		return wildcard.data