请教一下程序的错误，怎么完善程序

报错说不能重载具有相同参数类型的静态和非静态成员函数？？

#include <iostream>
#include <string>
using namespace std;
class Ebook {
private:
    string name[10];
    int pnumber;
public:
    Ebook(string name_, int number) {
        name[10] = name_;
        pnumber = number;
    }
    static void sort(Ebook &a,Ebook &b);
    void print(){
        cout << name[10] << "," << pnumber << endl;
};
void sort(Ebook& a, Ebook& b) {
    if (a.name < b.name) {
        a.print();
        b.print();
    }
    else{
        b.print();
        a.print();
    }
}
int main() {
    Ebook a("Sheldon", 12345678910);
    Ebook b("Penny", 98765432110);
    return 0;
}

你那个定义函数加上类名和作用域。不然他会认为那是全局函数呢