Broken C++ Read File Code

//Data types
#include <string>
#include <cstring>
#include <tchar.h>

#include <cstdint>
#include <cmath>
#include <vector>

//Streams
#include <stdio.h>
#include <cstdio>
#include <iostream>
#include <iomanip>
#include <sstream>

#include <fstream>

char* readShader(char* filename) {
    FILE* infile;
    int tempint;
    tempint = fopen_s(&infile, filename, "r");
    if (tempint != 0) {
        std::cout << "Error " << tempint << " when reading file " << filename << std::endl;
        return "Error reading file.";
    }

    boolean loop = true;
    int loops = 0;
    char* text = "";
    char temptext[2];
    int index = 0;

    while (loop) {
        fgets(temptext, 2, infile);
        //std::cout << temptext;
        if (temptext != NULL && std::feof(infile) != 1) {

            //this next section is what causes errors
            if (loops == 0) {
                //strcpy_s(text, 2, temptext);
                text[0] = temptext[0];
                std::cout << text;
            }
            else {
                //strcat_s(text, 2, temptext);
                text[1] += temptext[1];
                std::cout << text;
            }
            loops++;
        }
        else {
            loop = false;
        }

    }
    fclose(infile);
    return text;
}