diff --git a/cpp-base64 b/cpp-base64
deleted file mode 160000
index 6420804..0000000
--- a/cpp-base64
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 6420804f7ba10e8c3049c6e3b59ec88c88d808a6
diff --git a/src/class/monster.cpp b/src/class/monster.cpp
deleted file mode 100644
index ce6aff5..0000000
--- a/src/class/monster.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-#include "src/class/monster.hpp"
-
-Monster::Monster(std::string monsterName)
-    : Character(monsterName)
-{
-    bounty = 0;
-}
-
-Monster::Monster(std::string monsterName, int monsterMaxHP, int monsterAtk, int monsterDef)
-    : Character(monsterName, monsterMaxHP, monsterAtk, monsterDef)
-{
-    bounty = 0;
-}
-
-Monster::Monster(std::string monsterName, int monsterMaxHP, int monsterAtk, int monsterDef, int monsterBounty)
-    : Character(monsterName, monsterMaxHP, monsterAtk, monsterDef)
-{
-    bounty = monsterBounty;
-}
-
-int Monster::getBounty()
-{
-    return bounty;
-}
\ No newline at end of file
diff --git a/src/class/monster.hpp b/src/class/monster.hpp
deleted file mode 100644
index 814813e..0000000
--- a/src/class/monster.hpp
+++ /dev/null
@@ -1,19 +0,0 @@
-#ifndef HACKTHEGAME_MONSTER_HPP
-#define HACKTHEGAME_MONSTER_HPP
-
-#include "src/class/character.hpp"
-
-class Monster : public Character
-{
-  protected:
-    int bounty;
-
-  public:
-    Monster(std::string monsterName);
-    Monster(std::string monsterName, int monsterMaxHP, int monsterAtk, int monsterDef);
-    Monster(std::string monsterName, int monsterMaxHP, int monsterAtk, int monsterDef, int monsterBounty);
-    
-    int getBounty();
-};
-
-#endif
\ No newline at end of file
diff --git a/src/interface/battle0.cpp b/src/interface/battle0.cpp
deleted file mode 100644
index d2383a9..0000000
--- a/src/interface/battle0.cpp
+++ /dev/null
@@ -1,37 +0,0 @@
-#include "src/interface/battle0.hpp"
-
-int startBattle(Player *player, Monster *monster)
-{
-    printf(" ===== BATTLE INFO  ===== \n");
-
-    printf("%15s (Lv.%n):\n", player->getName(), player->getLevel());
-    printf("  HP : %n/%n\n", player->getCurrentHP(), player->getMaxHP());
-    printf("  Att: %n\n", player->getAtt());
-    printf("  Def: %n\n", player->getDef());
-
-    printf("%15s:\n", monster->getName());
-    printf("  HP : %n/%n\n", monster->getCurrentHP(), monster->getMaxHP());
-    printf("  Att: %n\n", monster->getAtt());
-    printf("  Def: %n\n", monster->getDef());
-
-    printf(" ===== BATTLE START ===== \n");
-    while (player->isAlive() && monster->isAlive())
-    {
-        printf("%15s and %15s attacked each other !!!\n", player->getName(), monster->getName());
-        printf("%15s lose %d HP...\n", player->getName(), player->defend(monster->getAtt()));
-        printf("%15s lose %d HP...\n", monster->getName(), monster->defend(player->getAtt()));
-    }
-
-    printf(" ===== BATTLE  END  ===== \n");
-    if (player->isAlive())
-    {
-        player->restoreHP();
-        printf("YOU WIN !!!\n");
-        return 1;
-    }
-    else
-    {
-        printf("YOU LOSE !!!\n");
-        return 0;
-    }
-}
\ No newline at end of file
diff --git a/src/interface/battle0.hpp b/src/interface/battle0.hpp
deleted file mode 100644
index 11f3007..0000000
--- a/src/interface/battle0.hpp
+++ /dev/null
@@ -1,11 +0,0 @@
-#ifndef HACKTHEGAME_BATTLESYSTEM_VERSION_000_HPP
-#define HACKTHEGAME_BATTLESYSTEM_VERSION_000_HPP
-
-#include "src/class/monster.hpp"
-#include "src/class/player.hpp"
-
-#include <cstdio>
-
-int startBattle(Player *player, Monster *monster);
-
-#endif
\ No newline at end of file