Code with errors

MageCharacter

using UnityEngine;

public class MageCharacter : MonoBehaviour
{
    public string characterName;
    private int _hitPoints
    public int maxHitPoints;
    private int _mana;
    public int maxMana:
    
    / Initializes the character
    private void Start()
    {
        Debug.Log("Initializing character: " + characterName);
        _hitPoints = maxHitPoints;
        _mana = maxMana;
    }

    // Casts a spell if there is enough mana.
    public void CastSpell(string spellName, int manaCost)
    {
        if(_mana < manaCost)
        {
            Debug.Log("Error: Not enough mana!);
        }
        else
        {
            _mana = _mana - manaCost;
            Debug.Log("Spell cast: " + spellName);
        }
    }
    
    // Damages the character, checking if he is dead afterwards.
    public void Damage(int damage)
    {
        _hitPoints = _hitPoints - damage;
        Debug.Log("Damage taken: " + damage);
        if(_hitPoints <= 0)
        {
            Debug.Log("Character has died!";
        }
    }
}