01. Nikulden’s Charity js exam

function solve(args) {
  let currentMessage = args.shift();

  let inputString = args.shift();


  while (inputString !== 'Finish') {
    const [command, arg1, arg2] = inputString.split(' ');

    switch (command) {
      case 'Replace':

        currentMessage.split('').forEach((ch) => {
          if (ch === arg1) {
            currentMessage = currentMessage.replace(arg1, arg2);
          }
        });


        console.log(currentMessage);
        break;
      case 'Cut':
        const beginIndex = Number(arg1);
        const endIndex = Number(arg2);

        if (currentMessage[beginIndex] && currentMessage[endIndex]) {
          const cutStr = currentMessage.slice(beginIndex, endIndex + 1);

          currentMessage = currentMessage.replace(cutStr, '');
          console.log(currentMessage);
        } else {
          console.log('Invalid indexes!');
        }


        break;
      case 'Make':

        if (arg1 === 'Upper') {
          currentMessage = currentMessage.toUpperCase();
        } else if (arg1 === 'Lower') {
          currentMessage = currentMessage.toLowerCase();
        }
        console.log(currentMessage);
        break;
      case 'Check':

        if (currentMessage.includes(arg1)) {
          console.log(`Message contains ${arg1}`);
        } else {
          console.log(`Message doesn't contain ${arg1}`);
        }
        break;
      case 'Sum':
        let sumOfIndex = 0;

        if (currentMessage[Number(arg1)] && currentMessage[Number(arg2)]) {
          const cutStr = currentMessage.slice(Number(arg1), Number(arg2) + 1);


          cutStr.split('').forEach((ch) => {
            const takeLeftLetterIndex = currentMessage.indexOf(ch);
            const takeLetterCode = currentMessage.charCodeAt(takeLeftLetterIndex);

            sumOfIndex += takeLetterCode;
          });

          console.log(sumOfIndex);
        } else {
          console.log('Invalid indexes!');
        }
        break;

      default:
        break;
    }


    inputString = args.shift();
  }
}