Potential fix for code scanning alert no. 86: Potentially overrunning write

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: lucasssvaz

libraries/ESP32/examples/FreeRTOS/Mutex/Mutex.ino

@@ -72,16 +72,16 @@ void Task(void *pvParameters) {  // This is a task.
         int new_value = random(1000);
 
         char str0[32];
-        sprintf(str0, " %d <- %d      |", shared_variable, new_value);
+        snprintf(str0, sizeof(str0), " %d <- %d      |", shared_variable, new_value);
         char str1[32];
-        sprintf(str1, "                 | %d <- %d", shared_variable, new_value);
+        snprintf(str1, sizeof(str1), "                 | %d <- %d", shared_variable, new_value);
         Serial.printf("%s\n", task_num ? str0 : str1);
 
         shared_variable = new_value;
         delay(random(100));  // wait random time of max 100 ms - simulating some computation
 
-        sprintf(str0, " R: %d          |", shared_variable);
-        sprintf(str1, "                 | R: %d", shared_variable);
+        snprintf(str0, sizeof(str0), " R: %d          |", shared_variable);
+        snprintf(str1, sizeof(str1), "                 | R: %d", shared_variable);
         Serial.printf("%s\n", task_num ? str0 : str1);
         //Serial.printf("Task %d after write: reading %d\n", task_num, shared_variable);