Add border to the array
let picture = ["abc", "ded"];
function addBorder(picture) {
//adding the * on the top of the picture array as equal to the lenght of the top element of the array.
let top = '*'.repeat(picture[0].length);
picture.unshift(top);
//looping through the array and concat the * at the end and the start of the array
for(let i = 0; i < picture.length; i++){
picture[i] = picture[i] + '*';
picture[i] = '*' + picture[i];
}
//adding the * on the bottom of the picture array as equal to the lenght of the last element of the array.
let bottom = '*'.repeat(picture[1].length);
picture.push(bottom);
return picture;
}