data-structure-service/src/main/java/com/example/data_structure/controller/HelloController.java

package com.example.data_structure.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class HelloController {
    @RequestMapping("/index")
    public String sayHello(){
        return "index";
    }
}