Function addlenmod

src/Chain/libraries/glua/lstrlib.cpp:1040–1047

** add length modifier into formats */

** add length modifier into formats
*/
static void addlenmod(char *form, const char *lenmod) {
    size_t l = strlen(form);
    size_t lm = strlen(lenmod);
    char spec = form[l - 1];
    strcpy(form + l - 1, lenmod);
    form[l + lm - 1] = spec;
    form[l + lm] = '\0';
}

static int str_format(lua_State *L) {
    int top = lua_gettop(L);