World Tour

function worldTour(input) {
  let string = input.shift();

  while (input[0] != "Travel") {
    let line = input.shift().split(":");
    let command = line.shift();

    if (command == "Add Stop") {
      let index = Number(line.shift());
      let str = line.shift();

      if (index >= 0 && index <= string.length) {
        let left = string.substr(0, index);
        let right = string.substr(index);
        string = left + str + right;
      }

      console.log(string);
    }

    if (command == "Remove Stop") {
      let startIndex = Number(line.shift());
      let endIndex = Number(line.shift());

      if (
        startIndex >= 0 &&
        startIndex < string.length &&
        endIndex >= 0 &&
        endIndex < string.length &&
        startIndex <= endIndex
      ) {
        let remove = string.slice(startIndex, endIndex + 1);
        string = string.replace(remove, "");
      }
      console.log(string);
    }

    if (command == "Switch") {
      let oldStr = line.shift();
      let newStr = line.shift();
      if (string.includes(oldStr)) {
        string = string.split(oldStr).join(newStr);
      }
      console.log(string);
    }
  }
  console.log(`Ready for world tour! Planned stops: ${string}`);
}
worldTour([
  "Hawai::Cyprys-Greece",
  "Add Stop:7:Rome",
  "Remove Stop:11:16",
  "Switch:Hawai:Bulgaria",
  "Travel",
]);