Spellbook Unraveling

function solve(input){
let message= input.shift();

let firstLine=input.shift();
while(firstLine !='End'){
    const[cmd, fromindex, toindex]= firstLine.split('!');

    switch(cmd){
 case'RemoveEven':

 let newMessage='';
   for (let i = 0; i < message.length; i++) {
     if(i % 2==0){
        newMessage +=message[i];
     }
   }
     message= newMessage;
     console.log(message);
 break;
 case'TakePart':
 let start=Number(fromindex);
 let end=Number(toindex);
 let newMessage1='';
   newMessage1= message.substring(start,end);
   message=newMessage1;
   console.log(message);
 break;
 case'Reverse':
 let substr=fromindex;
 if(message.includes(substr)){

  //cut it out
  message= message.replace(substr,"");

 //reverse
 let newcuttedmess='';
 for (let j =substr.length-1; j >=0 ; j--) {
 newcuttedmess +=substr[j];

 }
 message +=newcuttedmess;// add to the ened
 console.log(message);

 }
 else{
    console.log('Error');
 }
 break;

    }

    firstLine=input.shift();

}

console.log(`The concealed spell is: ${message}`);


}

solve(["asAsl2adkda2mdaczsa",
"RemoveEven",
"TakePart!1!9",
"Reverse!maz",
"End"]
);