rectangle etoile drawing

function draw_rectangle(l, L) {
   let str="";
   for(let i=1;i<=l;i++){
      str+="*";
      for(let j=2;j<=L-1;j++){
         if(i==1 || i==l)
            str+="*";
         else
            str+="<span class='hide'>*</span>";
      }
      if( L>1 )
         str+="*";
      str+="<br>";
   }
   return str;
}