const names = ["ruky" , "nethmi", "janith" , "rukmal", "sahan" , "rukshan"]

​

​

console.log(createBuckets(names, 0))

​

function createBuckets(names, indent){

  const buckets = []

  const output =  []

  var n = 0

​

  while(n<=26){

    buckets[n] = []

    n++

  }

​

  for (var i = 0; i <= names.length-1; i++) {

     var char = names[i].charCodeAt(indent)-97

     buckets[char].push(names[i])

  }

​

  for (var i = 0; i <= buckets.length-1; i++) {

    if(buckets[i].length > 1) {

      const tempOutput = createBuckets(buckets[i],indent+1)

      for (var o=0; o <= tempOutput.length-1;o++) {

        if (tempOutput[o].length === 1) output.push(tempOutput[o])

      }

    } else if (buckets[i].length === 1) {

      output.push(buckets[i])

    }

  }

​

  return output

}

​

​

​

​