vs2022编译运行后报乱码如何解决？

这段C代码编译运行后为什么会有乱码出现？

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>

typedef struct
{
    uint8_t datetime[6];
    uint32_t len;
    uint8_t* data;
}DATA_T;

DATA_T data11;

void supp_data_save()
{
    size_t Return;
    int i;
    uint8_t data1[64] = { 0 };
    uint8_t* buf;

    memset(&data11, 0, sizeof(data11));

    buf = (uint8_t*)malloc(10);
    memcpy(data11.datetime, "202207\0", 6);
    data11.len = 1;
    memcpy(buf, "1233211231\0", 10);
    data11.data = buf;
    printf("data11: %c\r\n", data11.data[0]);
    printf("data11: %c\r\n", data11.data[1]);
    printf("data11: %c\r\n", data11.data[2]);
    printf("==============================\n");

    for (i = 0; i < 10; i++)
    {
        printf("%c", data11.data[i]);
    }
    printf("\r\n00\r\n");
    printf("==============================\n");
    int len1 = (sizeof(data11) + 10 - 1);
    memcpy(data1, &data11, len1);
    for (i = 0; i < 10; i++)
    {
        printf("%c", data1[i]);
    }
    printf("\r\n");
    printf("==============================\n");
    printf("data111: %c\r\n", data11.data[10]);
    printf("data111: %c\r\n", data11.data[11]);
    printf("data111: %c\r\n", data11.data[12]);
    printf("\r\n000\r\n");
}

int main()
{
    supp_data_save();
    return 0;
}

buf = (uint8_t*)malloc(10); //10字节的空间
memcpy(data11.datetime, "202207\0", 6);//datetime[] 这里7个字节，不是6个字节
字符数组越界操作。

data11.data指针就申请了10个字节的空间，你访问data11.data[10]，data11.data[11]本身就是越界访问，显示无效字符没毛病

整个程序好好调整下，内存越界的地方不少