Random characters in 2d array C

Question

Hello I'm trying to make a program in C that will generate an 2d array with random characters, but two columns must still be empty (filled with space). but when I run the program I get more characters than lines, which is a problem since there can be as many characters as lines :

https://i-stack-imgur-com.translate.goog/Fvg9c.png?_x_tr_sl=en&_x_tr_tl=sk&_x_tr_hl=sk&_x_tr_pto=nui,sc

Thank you for your response

#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include "ballsortpuzzle.h" in this file I have declaration this function
#include <time.h>

void generator(const int rows, const int columns, char field[rows][columns]){
 srand ( time(NULL) );
    char characters[] = {'#', '@', '^', '*', '%', '+', '~', '?', '-', '/'};
    int randomCol  = rand() % columns;
    int q = randomCol;
   while( q == randomCol){
   q = rand() % columns;
   }

   for( int i = 0 ;  i < rows ; i++){
     for( int k = 0; k < columns; k++){
        int randomChar =rand() % 4;
        int thisChar = characters[randomChar];
        if(k == randomCol ){
         field[i][k] = ' ';
        }
        else{
        field[i][k] = thisChar;
        }
      }
   }

   for( int a = 0; a < rows; a++){

    for(int l = 0 ; l <  columns; l++) {
        printf("%c " , field[a][l]);
    }
    printf("\n");
   }
}

MAIN.c

#include <stdio.h>
#include <stdlib.h>
#include "ballsortpuzzle.h"

int main(){
 char field[10][10];
 generator(4,6,field);
}

ballsortpuzzle.h

#include <stdbool.h>

void generator(const int rows, const int columns, char field[rows][columns]);