how to solve this segmentation fault : i try to make a char matrix for a tic tak toe game i allocated memory for it but i can't access it , it shows me a segmentation fault i can't figure out why      


       #include <stdio.h>
       #include <stdlib.h>
 
        //fonction to make a char matrix 
            void make_board (char** board){
             board = malloc(sizeof(char*)*3);
              for(int i=0;i<3;i++){
                 board[i] = malloc(sizeof(char)*3);
             }
              for(int i=0;i<3;i++){
                for(int j=0;j<3;j++){
                   board[i][j]='x';
                  }
               }
          }
       
        //main fonction
        int main (){
            char ** board;
            make_board(board);
           printf("%c\n",**board);/*when i try to access it it show me a 
           segmentation fault*/
    