remove include Buffer.h

Password_manager/include/cryptography.h

@@ -1,10 +1,10 @@
 #pragma once
 #include <cstdint>
-#include "buffer.h"
 
 struct evp_cipher_ctx_st;
 typedef struct evp_cipher_ctx_st EVP_CIPHER_CTX;
 
+class Buffer;
 
 class Cryptography
 {

Password_manager/include/func.h

@@ -1,9 +1,10 @@
 #pragma once
 #include <fstream>
-#include "buffer.h"
 
 constexpr auto MAX_STRING_SIZE = 21;
 
+class Buffer;
+
 struct Pass
 {
 	char label[MAX_STRING_SIZE];