cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration string/memmem.c -o string/memmem -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
string/memmem.c: In function ‘main’:
string/memmem.c:10:21: error: implicit declaration of function ‘memmem’; did you mean ‘memset’? [-Wimplicit-function-declaration]
   10 |         void* ptr = memmem(haystack, sizeof(haystack), "st\0a", 4);
      |                     ^~~~~~
      |                     memset
string/memmem.c:10:21: error: initialization of ‘void *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]