#include <stdio.h>

void fonction (char Depart[],char Copie[][3]);

int main() {

char Depart[9];
char Copie[3][3];

printf("Chaine de depart: ");
scanf("%s",Depart);

fonction(Depart,Copie);

printf("Copie:%s\n",Copie);


return 0;
}                



void fonction (char Depart[],char Copie[][3]) {

int i,j=0;

while (Depart[j] != '\0') {
j++;
for (i=0;i<=8;i++) {
**(Copie+i)=Depart[j];
}
}
}

v.c: In function ‘main’:
v.c:15:16: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘char (*)[3]’ [-Wformat=]
   15 | printf("Copie:%s\n",Copie);
      |               ~^    ~~~~~
      |                |    |
      |                |    char (*)[3]
      |                char *

Chaine de depart: azerty
Copie:
*** stack smashing detected ***: terminated
Abandon (core dumped)