Nikulden’s Charity

function solve(input){

    let strForMan = input.shift();
    let command = input.shift();

    while(command !== 'Finish'){

        if(command.includes("Replace")){
            let arrReplace = command.split(' ');  //Replace a e
            strForMan=strForMan.split(arrReplace[1]).join(arrReplace[2]);
            console.log(strForMan);
        }else if(command.includes("Cut")){    // {startIndex} {endIndex}
             let arrCut = command.split(' ');
             let strsplit = strForMan.split('');
             let startI = Number(arrCut[1]);
             let endI = Number(arrCut[2]);
             if(startI>=0 && endI<strsplit.length){
                strsplit.splice(startI, endI);
                strForMan = strsplit.join('');
                console.log(strForMan);
             }else{
                 console.log('Invalid indexes!');
             }
        }else if(command.includes("Make")){  // {Upper/Lower}
            if(command.includes("Upper")){
                strForMan = strForMan.toUpperCase();
                console.log(strForMan);
            }else{
                strForMan = strForMan.toLowerCase();
                console.log(strForMan);
            }
        }else if(command.includes("Check")){  // {string}
                let checkArr = command.split(' ');
                if(strForMan.includes(checkArr[1])){
                    console.log(`Message contains ${checkArr[1]}`);
                }else{
                    console.log(`Message doesn't contain ${checkArr[1]}`);
                }
        }else if(command.includes("Sum")){   // {startIndex} {endIndex}
                let sumArr = command.split(' ');
                let startI = Number(sumArr[1]);
                let endI = Number(sumArr[2]);
                let c = 0;
                if(startI>=0 && endI<strForMan.length){
                    let substr = strForMan.substr(startI, endI);
                   //console.log(substr);

                   for (let i = 0; i < substr.length; i++) {  //substr е стринг = LIKE
                       c += substr.charCodeAt(i);
                   }
                    console.log(c);
                    c = 0;
                }else{
                    console.log('Invalid indexes!');
                }
        }
        command = input.shift();
    }

}
solve([
    'ILikeSharan',
    'Replace a e',
    'Make Upper',
    'Check SHEREN',
    'Sum 1 4',
    'Cut 1 4',
    'Finish'
  ]);