// # App
            struct App {
                struct __OsHelper__    __App_osHelper__;
                struct Scalpi_Logger   logger;
                uint64_t               tick;
            };
// function prototypes
    bool   __OsFile_exist__(             const char* file_name, size_t file_name_len);
    bool   __OsMem_alloc__(              uintptr_t *ret_data_addr, size_t size); // todo rename to __OsMem_alloc__
    void   __OsMem_free__(               uintptr_t ret_data_addr);

    size_t __OsFallbackConsole_write__(  void* unused_ctx, char* data, size_t len);
// globals
    struct App global_app;
// functions
    // core
        // mem
            // bits operations