1. get unique skills from below variable: let test = [{id:1, name:"a", skills:["React", "Angular", "Node"]}, {id:2, name:"b", skills:["Node", "SQL", "AWS"]}, {id:3, name:"c", skills:["Java", "Angular", "Mongo"]}]; 2. https://www.geeksforgeeks.org/puzzle-measure-4l-using-given-3-buckets/
