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https://www.cnblogs.com/l1ng14/p/14164419.html
“必须函数签名相同(函数名,参数和返回值(类型,个数,顺序)都相同),否则会转换失败,无法实现该接口。”
func Sum(i int,j int)(int,error) 脑海里的函数签名应该联想到是"SumI&I_I&ERR"这样拼接后的尽量可以接近唯一,从而方便编译时的自动区分的东西