Function SDL_JoystickGetGUIDString 

pub unsafe extern "C" fn SDL_JoystickGetGUIDString(
    guid: SDL_JoystickGUID,
    pszGUID: *mut c_char,
    cbGUID: c_int,
)

Return a string representation for this guid.

pszGUID must point to at least 33 bytes. 32 for the string, plus a NULL terminator.