En realitat és la primera part del puzzle

aoc_25_1_1/src/aoc25.c

@@ -11,10 +11,10 @@ int main(void) {
     char direction[2];
     int password = 0;
 
-    FILE *fptr = fopen("aoc25_1.txt", "r");
+    FILE *fptr = fopen("aoc25_1_1.txt", "r");
 
     if (fptr == NULL) {
-        printf("Error, puzzle input aoc25_1.txt not found\n");
+        printf("Error, puzzle input aoc25_1_1.txt not found\n");
         return (1);
     }