stdout:

stderr:
/home/wangfiox/Documents/database/final_performance_c/sy/fft2.sy:24:5: warning: conflicting types for built-in function ‘memmove’; expected ‘void *(void *, const void *, long unsigned int)’ [-Wbuiltin-declaration-mismatch]
   24 | int memmove(int dst[], int dst_pos, int src[], int len){
      |     ^~~~~~~
/home/wangfiox/Documents/database/final_performance_c/sy/fft2.sy:2:1: note: ‘memmove’ is declared in header ‘<string.h>’
    1 | #include "sylib.h"
  +++ |+#include <string.h>
    2 | #define mod 998244353