code: func (c *Context) Param(key string) string {
  	return c.Params.ByName(key)
  }
docs: /************************************/
  /************ INPUT DATA ************/
  /************************************/
  // Param returns the value of the URL param.
  // It is a shortcut for c.Params.ByName(key)
  //     router.GET("/user/:id", func(c *gin.Context) {
  //         // a GET request to /user/john
  //         id := c.Param("id") // id == "john"
  //     })