Method "embedFileSystem.Exists " does not use parameter "prefix"

[magicodex]

When I use embed.FS and the static resource url prefix is ​​"/demo/", the static resource cannot be found.
Here is my code:

import (
  "embed"
  "github.com/gin-gonic/gin"
  "github.com/gin-contrib/static"
)

var embedFS embed.FS
engine := gin.Default()

staticFS := static.EmbedFolder(embedFS , "public)
staticHandlerFunc := static.Serve("/demo/", staticFS )
engine.Use(staticHandlerFunc)

The problem lies in this method( file "embed_folder.go"):

func (e embedFileSystem) Exists(prefix string, path string) bool {
  _, err := e.Open(path)
  return err == nil
}

This is the code I changed and everything is working fine:

func (e embedFileSystem) Exists(prefix string, path string) bool {
  if prefix != "" {
    path = strings.TrimPrefix(path, prefix)
  }

  _, err := e.Open(path)
  return err == nil
}