Function string_init

samples/shared/lodepng.cpp:307–311

init a {char*, size_t} pair for use as string*/

/*init a {char*, size_t} pair for use as string*/
static void string_init(char** out)
{
  *out = NULL;
  string_resize(out, 0);
}

/*free the above pair again*/
static void string_cleanup(char** out)