(C language) I'm trying to use a pointer using the parameters I got from the function, but it turned off right away without a compilation error, so I can't catch the error

#include<stdio.h>

int leaf(int *arr,int len)
{
    int **k ;
    k = &arr;
    **(k+1)=2;// Put the secondary pointer and put the address of the arr, and it bounces
}

int main()
{
    int ab[] = {1,5,5,4,5,8,7,7};

    leaf(ab,sizeof(ab)/sizeof(int));

    for(int i=0; i<(sizeof(ab)/sizeof(int)); i++)
    {
        printf("%d",ab[i]); 
    }
}

#include<stdio.h>

int leaf(int *arr,int len)
{
    int *k ;
    k = arr; //This is a pointer, but I didn't even put the arr address value, but the value I wanted was printed out...
    *(k+1)=2;
}

int main()
{
    int ab[] = {1,5,5,4,5,8,7,7};

    leaf(ab,sizeof(ab)/sizeof(int));

    for(int i=0; i<(sizeof(ab)/sizeof(int)); i++)
    {
        printf("%d",ab[i]);

    }

But if you edit it like this,
// I'm sure int *arr is a pointer to arr, so why is that?   
}