Expected unqualified-id before string constant

Projects Programming
7

Where is that code from? All I see is code like this:

#define LED_BLINK_HALF 5
#define LED_BLINK_1T 6
#define LED_BLINK_2T 7
#define LED_BLINK_EVERY_10T 8
#define LED_BLINK_XT 9


const String url = "/trigger/" + trigger + "/with/key/" + key;


int nbr_of_new_letters = 0;
int total_nbr_of_letters = 0;
unsigned long time_of_last_letter = 0;

from Boite-aux-lettres/main.ino at master · Matheo-Moinet/Boite-aux-lettres · GitHub. No "Trigger" in front of the const String url line.