如何删除红移中第三个特定字符之后的所有字符？

def remove_after_third_character(string, target_character):
    count = 0
    index = -1

    # 遍历字符串，找到第三个特定字符的位置
    for i, char in enumerate(string):
        if char == target_character:
            count += 1
            if count == 3:
                index = i
                break

    # 删除第三个特定字符之后的所有字符
    if index != -1:
        string = string[:index+1]

    return string

# 测试代码
redshift = "ABCXDEFGXHIJKLMXNOPQRSTUVWXYZ"
target_char = "X"
result = remove_after_third_character(redshift, target_char)
print(result)