提交报错： Runtime Error. Received signal 11: Segmentation fault with invalid memory reference.

代码见下：

#include <stdio.h>
int main(void)
{
    int i = 1;
    char string[10001] = {'\0'};
    string[0] = getchar();
    for(; string[i - 1] != '\n'; i++)
        string[i] = getchar();//输入模块
    
    i -= 1;
    for(int p = 0; p < i; p++)
    {
        if(string[p] == 65 || string[p] == 97)
            printf("%c", string[p] + 25);
        else if ((string[p] > 65 && string[p] <= 90) || (string[p] > 97 && string[p] <= 122))
            printf("%c", string[p] - 1);
        else
            printf("%c", string[p]);
    }//判断模块
    return 0;
}