fix some stuff

util_unit2.c

@@ -0,0 +1,16 @@
+#include "util_unit.h"
+
+/* we loop over instead of shifting the pointer to make sure we don't skip
+unexisting tests and end up in unallocated/invalid memory */
+t_unit_test	*get_test_at(t_unit_test *head, size_t target_idx)
+{
+	size_t	j;
+
+	j = 0;
+	while ((j < target_idx) && head)
+	{
+		head = head->next;
+		j++;
+	}
+	return (head);
+}