Token refactor and better logs

v0/test_log.c

@@ -19,3 +19,15 @@ static void test_log_error(void) {
 
     log_set_output(NULL); // Reset to default
 }
+
+static void test_log_on_line(void) {
+    const char* expected =
+        "--- test.c ---\n"
+        "1| int main() []\n"
+        "              ^^\n"
+        "   unexpected token\n";
+
+    log_on_line("test.c", "int main() []", 1, 12, 13, "unexpected token");
+    
+    assert_log(expected, "expected formatted error message");
+}