if(b >= currentSizeS-1) {          //realoc Array of words
        currentSizeS = currentSizeS*2;  //line 70
    if(realloc(stringArr, currentSizeS*sizeof(char)) == NULL) printf("error\n");
        stringArr[b] = arr; //b is counter
}

==2507== Invalid write of size 8
==2507==    at 0x4009BE: main (main.c:72)
==2507==  Address 0x543c088 is 72 bytes inside a block of size 80 free'd
==2507==    at 0x4C28CCE: realloc (vg_replace_malloc.c:632)
==2507==    by 0x400996: main (main.c:71)