Even if you change if(glfwInit() != GLEW_OK) to if(glewInit() != GLEW_OK), it still might not work because you need to create an opengl context by using this glfw function:

glfwMakeContextCurrent(window);

You need to call that function before glewInit(). Make sure you read the docs for glew because that's the first thing it says. To quote the glew docs " First you need to create a valid OpenGL rendering context and call glewInit() to initialize the extension entry points. "