fix alloc between two allocations, fix free (uninitialized value)

main.c

@@ -1,10 +1,17 @@
 #include "srcs/includes/malloc.h"
+#include <stdio.h>
 
 int main(void)
 {
 	void *ptr;
 
-	ptr = ft_malloc(1013);
+	ft_malloc(1013);
+	printf("%p\n",ft_malloc(100));
+	ft_malloc(100);
+	ptr = ft_malloc(1000);
+	ft_malloc(100);
+	ft_malloc(100);
 	ft_free(ptr);
+	ft_malloc(123);
 	show_alloc_mem();
 }