interface WeaponBehaviour {
        void UseWeapon();
    }

    class KnifeBehaviour : WeaponBehaviour {
        public void UseWeapon() {
            // implements stabbing with knife
        }
    }

    class AxeBehaviour : WeaponBehaviour {
        public void UseWeapon() {
            // implemenets chopping with axe
        }
    }

    // etc.

    abstract class Character {
        WeaponBehaviour weapon;
        void Fight() {
            weapon.UseWeapon();
        }

        void SetWeapon(WeaponBehaviour weapon) {
            this.weapon = weapon;
        }
    }

    class Player : Character {
        // implement player class
    }