go语言接口实现错误 显示student2类型无法解析？-灵析社区

package main type People interface { Speak(string) string } type Student2 struct{} func (stu Stduent2) Speak(think string) (talk string) { if think == "帅" { talk = "你是个大帅比" } else { talk = "您好" } return } func main() { var peo People = Student2{} think := "bitch" println(peo.Speak(think)) } 希望输出结果是 你好