01. Warrior's Quest

function solve (input = []) {
    let skill = input.shift();

    for (const line of input) {
        if (line === 'For Azeroth') {
            break;
        }
        let [command, el1, el2, el3] = line.split(' ');
        if (command == 'GladiatorStance') {
            skill = skill.toUpperCase();
            console.log(skill)
        } else if (command == 'DefensiveStance') {
            skill = skill.toLowerCase();
            console.log(skill);

        } else if (command == 'Dispel') {
            let index = Number(el1);
            let letter = el2;
            if (index >= 0 && index < skill.length) {
                let symbol = skill[index];
                skill = skill.replace(symbol, letter);
                console.log(`Success!`);
            } else {
                console.log(`Dispel too weak.`);
            }

        } else if (command == 'Target' ) {
            if (el1 == 'Change') {
                let substring = el2;
                let secSubstr = el3;
                while (skill.includes(substring)) {
                    skill = skill.replace(substring, secSubstr)

                }
                console.log(skill);
            } else if (el1 === 'Remove') {
                let substr = el2;
                while (skill.includes(substr)) {
                    skill = skill.replace(substr, '')

                }
                console.log(skill)

            }

        } else {
            console.log("Command doesn't exist!");

        }
    }
}
/*console.log(solve([
    'fr1c710n',
    'GladiatorStance',
    'Dispel 2 I',
    'Dispel 4 T',
    'Dispel 6 O',
    'Dispel 5 I',
    'Dispel 10 I',
    'Target Change RICTION riction',
    'For Azeroth'
  ]))*/

solve([
    'DYN4MICNIC',
    'Target Remove NIC',
    'Dispel 3 A',
    'DefensiveStance',
    'Target Change d D',
    'target change D d',
    'For Azeroth'
  ])