It compiles on windows now I guess

src/parser.c

@@ -5,6 +5,25 @@
 #include <string.h>
 #include <ctype.h>
 
+#ifdef _WIN32
+size_t strnlen(const char *src, size_t n) {
+    size_t len = 0;
+    while (len < n && src[len])
+        len++;
+    return len;
+}
+
+char* strndup(const char *s, size_t n) {
+    size_t len = strnlen(s, n);
+    char *p = malloc(len + 1);
+    if (p) {
+        memcpy(p, s, len);
+        p[len] = '\0';
+    }
+    return p;
+}
+#endif
+
 GroundProgram createGroundProgram() {
     GroundProgram gp;
     gp.size = 0;