if err != nil {
				return ""
			}
			path = s
		}
		return path
	})
}

// findVersionElement returns the slice indices of the final version element /vN in path.
// If there is no such element, it returns -1, -1.
func findVersionElement(path string) (i, j int) {
	j = len(path)
	for i = len(path) - 1; i >= 0; i-- {
		if path[i] == '/' {