feat: added more lst functionality

srcs/lst/ft_lstclear.c

@@ -0,0 +1,13 @@
+#include "libft.h"
+#include <stdlib.h>
+
+void ft_lstclear(t_list **lst)
+{
+    t_list *tmp;
+    while (lst && *lst)
+    {
+        tmp = (*lst)->next;
+        free(*lst);
+        *lst = tmp;
+    }
+}