main.dart

void main() {
  start(['Jim', 'John', 'Nicole', 'Smith', 'What', 'Best team', 'Dart', 'Flutter', 'C#', 'bungo', 'Odd team']);
}  

List<String> teams;
List<List<String>> bracket = [];
int maxRounds;

void start(List<String> origTeams) {
  if (origTeams.length < 4) {
    return;
  }
  teams = List<String>.from(origTeams);
  if (teams.length.isOdd) {
    teams.add('bye_week');
  }
  maxRounds = (teams.length - 1);
  var splitTeams = splitList(teams);
  var rotatedTeams = splitTeams;
  for (var i = 1; i <= 3; i++) {
    print('Round: $i');
    for (var b = 0; b < rotatedTeams[0].length; b++) {
      bracket.add([rotatedTeams[0][b], rotatedTeams[1][b]]);
      print([rotatedTeams[0][b], rotatedTeams[1][b]]);
    }
    rotatedTeams = rotateTeams(splitTeams);
  }
}

List<List<String>> splitList(List<String> split) {
  var first = split.sublist(0, split.length ~/ 2);
  var last = split.sublist(split.length ~/ 2);
  return []..add(first)..add(last.reversed.toList());
}

List<List<String>> rotateTeams(List<List<String>> rotate) {
  var firstList = rotate[0];
  var secondList = rotate[1];
  var itemToMove = firstList.removeLast();
  secondList.insert(secondList.length - 1, itemToMove);
  var moveToFirst = secondList.removeAt(0);
  firstList.insert(1, moveToFirst);
  return []..add(firstList)..add(secondList);
}