memmove

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

int main (int argc, char **argv){

    char arr[]="0123456789";

    printf("%s\n",arr);

    //overlapping memory blocks
    memmove(arr, arr+2, 8);

    printf("%s\n",arr);

return 0;
}

/*
output:

0123456789
2345678989

 */