Update cv7/program.c

cv7/program.c

@@ -82,7 +82,7 @@ struct tree* read_tree() {
     // Read a line from stdin
     char* r = fgets(buffer, SIZE, stdin);
     if (r == NULL) {
-        fprintf(stderr, "Error: Failed to read input\n");
+        fprintf(stderr, "Chybna databaza\n");
         exit(1);  // Exit the program if reading fails
     }