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原理:先从输入文本中随机挑选一个字符(非end_chars)输出,然后在上面画一道斜线表示涂改,接着在旁边写下原来正确的字符
为了增加效果,目前设置是50%的概率进行涂改,同时为了迅速看反响如何,所以并没有将代码按原来的格式修改,如果反响不错,我就继续修改