declaration is incompatible with "void std::Student::setInfo(char *s, char *p)" (declared at line 10 of "Student.h")

I have the following files: Student.h and Student.cpp

// Student.h
namespace std
{
    class Student
    {
    private:
        char m_studentId[10];
        char m_programCode[4];
    public:
        void getInfo(void) const;
        void setInfo(const char *s, const char *p);
    };
}

Student.cpp

// Student.cpp
#include <iostream>
#include <cstring>
#include "Student.h"

using namespace std;

namespace std
{
    void Student::getInfo(void) const
    {
        cout << "Student ID: " << m_studentId << endl;
        cout << "Program: " << m_programCode << endl;
    }

    void Student::setInfo(const char *s,const char *p)
    {
        strcpy(m_studentId, s);
        strcpy(m_programCode, p);
    }
}

The code actually compiles and runs quite successfully. However, Visual Studio is giving me the error:

declaration is incompatible with "void std::Student::setInfo(char *s, char *p)" (declared at line 10 of "Student.h").

Thanks in advance.