CryptoCurrency

function solve(input){

    let Message= input.shift();


    let cmdline= input.shift();

    while (cmdline!='Buy') {

        let AllCmds= cmdline.split('?');
        switch (AllCmds[0]) {
        case "TakeEven":

        let NewMessage='';
        for (let i = 0; i < Message.length; i++) {
            if(i% 2==0)
            {
           NewMessage +=Message[i];

            }

        }
        Message= NewMessage;
        console.log(NewMessage);
        break;

        case'ChangeAll':
        let substring=AllCmds[1];
        let replacemen =AllCmds[2];

        while(Message.includes(substring)){
           Message= Message.replace(substring,replacemen)

        }

        console.log(Message);
                break;
        case 'Reverse':
            let substring1=AllCmds[1];
            if(Message.includes(substring1)){
                Message= Message.replace(substring1,'');

               let reversedMessage='';
               for (let j = substring1.length-1; j >= 0; j--) {
                reversedMessage +=substring1[j];
               }
               Message +=reversedMessage;
               console.log(Message);
            }
            else{
                console.log('error')
            }

                    break;
        }

        cmdline= input.shift();
    }


    console.log(`The cryptocurrency is: ${Message}`)
}