fix windows compilation error

c/src/include/utils.h

@@ -132,12 +132,14 @@ typedef struct {
 } Answer;
 
 Answer get_answer(uint16_t id) {
-    char *linepointer;
-    char *tabpointer;
     Answer ret = {
         .id = id,
     };
     char *answers = get_data_file("answers.tsv");
+    char *linepointer, *tabpointer;
+#ifdef _WIN32
+    rsize_t linemax = strlen(answers) + 1, tabmax;
+#endif
 
     if (!answers) {
         fprintf(stderr, "Error: Unable to get data from file\n");
@@ -147,13 +149,27 @@ Answer get_answer(uint16_t id) {
     char s_id[6];
     snprintf(s_id, sizeof(s_id), "%" PRIu16, id);
 
+#ifdef _WIN32
+    char *line = strtok_s(answers, &linemax, "\n", &linepointer);  // skip header
+    while ((line = strtok_s(NULL, &linemax, "\n", &linepointer)) != NULL) {
+        tabmax = strlen(line) + 1;
+#else
     char *line = strtok_r(answers, "\n", &linepointer);  // skip header
     while ((line = strtok_r(NULL, "\n", &linepointer)) != NULL) {
+#endif
+#ifdef _WIN32
+        char *token = strtok_s(line, &tabmax, "\t", &tabpointer);
+#else
         char *token = strtok_r(line, "\t", &tabpointer);
+#endif
         if (strcmp(token, s_id) != 0)
             continue;
 
+#ifdef _WIN32
+        token = strtok_s(NULL, &tabmax, "\t", &tabpointer);
+#else
         token = strtok_r(NULL, "\t", &tabpointer);
+#endif
         if (!token)
             continue;
 
@@ -168,12 +184,20 @@ Answer get_answer(uint16_t id) {
             return ret;
         }
 
+#ifdef _WIN32
+        token = strtok_s(NULL, &tabmax, "\t", &tabpointer);
+#else
         token = strtok_r(NULL, "\t", &tabpointer);
+#endif
         if (!token)
             continue;
         size_t size = strtoull(token, NULL, 10);
 
+#ifdef _WIN32
+        token = strtok_s(NULL, &tabmax, "\t", &tabpointer);
+#else
         token = strtok_r(NULL, "\t", &tabpointer);
+#endif
         if (!token)
             continue;