Enter the number of bits of first binary string
4
Enter the first string
1111
Enter the number of bits of the second string
5
Enter the second string
00000
=================================================================
==2226==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200000ecb2 at pc 0x0000004bfe77 bp 0x7ffe547da2f0 sp 0x7ffe547da2e8
WRITE of size 1 at 0x60200000ecb2 thread T0
    #0 0x4bfe76 in subtract /home/rob/Documents/reddit.c:95:5
    #1 0x4c2471 in multiply /home/rob/Documents/reddit.c:167:21
    #2 0x4c21b7 in multiply /home/rob/Documents/reddit.c:163:23
    #3 0x4c21b7 in multiply /home/rob/Documents/reddit.c:163:23
    #4 0x4c2c64 in main /home/rob/Documents/reddit.c:190:22
    #5 0x7f37fa78eb44 in __libc_start_main /build/glibc-uPj9cH/glibc-2.19/csu/libc-start.c:287
    #6 0x4bd01c in _start (/home/rob/Documents/a.out+0x4bd01c)

0x60200000ecb2 is located 0 bytes to the right of 2-byte region [0x60200000ecb0,0x60200000ecb2)
allocated by thread T0 here:
    #0 0x49f99b in __interceptor_malloc (/home/rob/Documents/a.out+0x49f99b)
    #1 0x4bfa6b in subtract /home/rob/Documents/reddit.c:91:17
    #2 0x4c2471 in multiply /home/rob/Documents/reddit.c:167:21
    #3 0x4c21b7 in multiply /home/rob/Documents/reddit.c:163:23
    #4 0x4c21b7 in multiply /home/rob/Documents/reddit.c:163:23
    #5 0x4c2c64 in main /home/rob/Documents/reddit.c:190:22
    #6 0x7f37fa78eb44 in __libc_start_main /build/glibc-uPj9cH/glibc-2.19/csu/libc-start.c:287

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/rob/Documents/reddit.c:95 subtract
Shadow bytes around the buggy address:
  0x0c047fff9d40: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9d50: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9d60: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9d70: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9d80: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c047fff9d90: fa fa fa fa fa fa[02]fa fa fa 03 fa fa fa 03 fa
  0x0c047fff9da0: fa fa 03 fa fa fa 02 fa fa fa 02 fa fa fa 02 fa
  0x0c047fff9db0: fa fa 02 fa fa fa 02 fa fa fa 02 fa fa fa 02 fa
  0x0c047fff9dc0: fa fa 02 fa fa fa 02 fa fa fa 02 fa fa fa 02 fa
  0x0c047fff9dd0: fa fa 02 fa fa fa 02 fa fa fa 03 fa fa fa 02 fa
  0x0c047fff9de0: fa fa 03 fa fa fa 03 fa fa fa 04 fa fa fa 03 fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  ASan internal:           fe
==2226==ABORTING