Catmengi

как сделать поиск по кругу на N радиус от ячейки 2мерного массива

Но в режиме отладки всё, как я уже писал выше, работает.

$ gcc -std=c99 -O2 -g3 -fsanitize=address main.c acp.c md5.c -o main
$ ./main
Base64('Hello') = "SGVsbG8="
MD5('Hello') = "8b1a9953c4611296a827abf8c47804d7"
=================================================================
==1045705==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x604000000071 at pc 0x7fb0d46486f8 bp 0x7ffd0affb580 sp 0x7ffd0affad30
WRITE of size 33 at 0x604000000071 thread T0
    #0 0x7fb0d46486f7 in __interceptor_strcat ../../../../src/libsanitizer/asan/asan_interceptors.cpp:377
    #1 0x564b2388c0de in prepareKeys /home/jcmvbkbc/tmp/toster/1331202/alphacrypt2/acp.c:263
    #2 0x564b2388cac4 in acraw /home/jcmvbkbc/tmp/toster/1331202/alphacrypt2/acp.c:319
    #3 0x564b2388d8c2 in acraws /home/jcmvbkbc/tmp/toster/1331202/alphacrypt2/acp.c:401
    #4 0x564b2388d8c2 in acraws_basic /home/jcmvbkbc/tmp/toster/1331202/alphacrypt2/acp.c:409
    #5 0x564b2388a62e in testSimpleEncryption /home/jcmvbkbc/tmp/toster/1331202/alphacrypt2/main.c:20
    #6 0x564b2388a368 in main /home/jcmvbkbc/tmp/toster/1331202/alphacrypt2/main.c:111
    #7 0x7fb0d44461c9 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
    #8 0x7fb0d4446284 in __libc_start_main_impl ../csu/libc-start.c:360
    #9 0x564b2388a440 in _start (/home/jcmvbkbc/tmp/toster/1331202/alphacrypt2/main+0x3440)

0x604000000071 is located 0 bytes to the right of 33-byte region [0x604000000050,0x604000000071)
allocated by thread T0 here:
    #0 0x7fb0d46b89cf in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:69
    #1 0x564b2388fee7 in md5StringHash /home/jcmvbkbc/tmp/toster/1331202/alphacrypt2/md5.c:227