Why am I printing more characters that i expect?

[babaliaris]

I'm trying to read a whole file as characters and then print those characters into the screen, but at the end , I'm getting some extra weird characters. Take a look at this output:

#version 330 core

layout(location = 0) in vec3 aPos;

void main()
{
        gl_Position = vec4(aPos, 1.0);
}═══════²²²²

The input file is:

#version 330 core

layout(location = 0) in vec3 aPos;

void main()
{
	gl_Position = vec4(aPos, 1.0);
}

And my source code:

#pragma once
#include <iostream>


class Shader
{

private:

	unsigned int m_id;

public:

	Shader(std::string vertex_filename, std::string fragment_filename);

	~Shader();

	void Bind();

};

#include "shader.h"
#include "glcall.h"
#include "engine_error.h"
#include <fstream>
#include <string>


struct ShaderSource 
{
	std::string vertex_src;
	std::string fragment_src;
};


static void ReadSources(std::string filename, bool is_vertex, struct ShaderSource *src)
{

	//Create a file object.
	std::ifstream file;

	//Open the file.
	file.open(filename, std::ios::in);

	//If the file opened successfully read it.
	if (file.is_open())
	{

		//Size of the file.
		file.seekg(0, std::ios::end);
		std::streampos size = file.tellg();
		file.seekg(0, std::ios::beg);

		//Allocate memory to store the data.
		char *data = (char *)malloc(sizeof(char) * size);

		//Read the data from the file.
		file.read(data, size);

		//Close the file.
		file.close();

		//This was the vertex file.
		if (is_vertex)
			src->vertex_src = (const char *)data;

		//This was the fragment file.
		else
			src->fragment_src = (const char *)data;

		//Release the memory for the data since I coppied them into the ShaderSource structure.
		free(data);
	}


	//Problem opening the file.
	else
		throw EngineError("There was a problem opening the file: " + filename);
}


Shader::Shader(std::string vertex_filename, std::string fragment_filename)
{

	//Testing if ReadSources works//
	ShaderSource source;

	ReadSources(vertex_filename, true, &source);
	std::cout << source.vertex_src;
	//Testing if ReadSources works//
}


Shader::~Shader()
{
}

void Shader::Bind()
{
	GLCall(glUseProgram(m_id));
}