draw square shape in command prompt java (no fill)

 public static String outline(char c,int size, int spaces_from_left_margin,int spaces_from_top, int spaces_from_bottom){
  
  StringBuffer sb = new StringBuffer();

  for(int i = 0 ; i <spaces_from_top;i++) sb.append("\n");

  for(int outer=0; outer < (size) ; outer++){

   for(int sflm=0 ; sflm < spaces_from_left_margin ; sflm++){
    sb.append(" ");     
   }

   if(outer!=0 && outer!=(size-1)){
    
    sb.append(c);

    for(int inner=0; inner < (size -2) ; inner++){
     sb.append(" ");  
    }

    sb.append(c);    
    sb.append("\n");
   
   }
   
   else{
    
    for(int inner=0; inner < size ; inner++){
     sb.append(c);
    }
   
   sb.append("\n");

   }
   
  }
  
  for(int i = 0 ; i <spaces_from_bottom;i++) sb.append("\n");
  
  return sb.toString();

 }