Write a function that take source and convert to target.

flat_list_to_tree.js

let source = [
  {
    name: "Account A"
  },
  {
    name: "Account B"
  },
  {
    name: "Account C"
  },
  {
    name: "Account D",
    parent: "Account C"
  },
  {
    name: "Account E",
    parent: "Account C"
  },
  {
    name: "Account F",
    parent: "Account E"
  },
  {
    name: "Account G",
    parent: "Account F"
  },
]

let target = [
  {
    name: "Account A"
  },
  {
    name: "Account B"
  },
  {
    name: "Account C",
    children: [
      {
        name: "Account D",
      },
      {
        name: "Account E",
        children: [
          {
            name: "Account F",
            children: [
              {
                name: "Account G"
              },
            ]
          },
        ]
      },
    ]
  }
]