This is example code "Hello World" with back button using flipper build tool

- code examples : 

This is example code "Hello World" with back button using flipper build tool.

flipper build tool doc : https://github.com/flipperdevices/flipperzero-firmware/blob/dev/documentation/fbt.md

hello_world.c : 

#include <furi.h>
#include <gui/gui.h>
#include <stdlib.h>
#include <gui/elements.h>
#include <input/input.h>

static void render_callback(Canvas* const canvas, void* ctx) {


    (void)ctx;
    // Clear the canvas
    canvas_clear(canvas);

    // Set font
    canvas_set_font(canvas, FontPrimary);

    // Draw the text