C++编程问题，帮忙纠错，谢谢

#include<string>
#include <iostream>
using namespace std;
void txt(string trans);
void ascii(string s);
string code(string message, int n);

int main()
{
char s='y';
while (s=='y' || s=='Y')
{
txt();
cout<<"Do you want to continue or not?(Y/N)"<<endl;
cin>>s;
}
return 0;
}

void txt()
{
string h, trans;
int coding=0;
cout<<"Pleaase input the text that you want to transfer."<<endl;
cin>>h;
getline(cin,h);
cout<<"Please input coding."<<endl;
cin>>coding;
trans=code(h,coding);
cout<<"The transfered message is: "<<trans<<endl;
void ascii(string trans);
}

string code(string h, int coding)
{
int len,i;
char c;
string trans;
len=h.le

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