Remove '100' until string is either empty or not equal to '100'

testWhile100.js

function writeOutput(inputData) {
    // Start writing code here to consume input, and return result.

    // separate input for consumptino
    const inputParts = inputData.split('\n');

    // shift first element to serve as line count
    const lineCount = Number(inputParts.shift());

    // update this after we have a result to minimize time complexity (no nested loops)
    let inputIndex = 0;

    function while100(input){

        let guard = 0;

        function doReplace(str){
            if (guard += 1 > 100000) return 'STOP';
            return str.replace('100', '')
        }

        let result = null;
        let a = doReplace(input);

        // result will stay null until
        // one or the other condition is met
        while (result === null) {

            let b = doReplace(a);

            // replacement result will be 100 or an empty string
            if (b === '100' || b === '') {
                result = true;
            }

            if (a === b) {
                result = false;
            }

            // console.log('');
            // console.log('- - - - - - - - - -')
            // console.log('a', a);
            // console.log('b', b);
            // console.log('- - - - - - - - - -')

            // do the switcheroo
            a = b;

        }

        return result;

    }

    for (let item of inputParts) {
        if (++inputIndex > lineCount) {
            break;
        }
        if (while100(item)) {
            console.log('yes')
        }
        else {
            console.log('no')
        }
    }

    return ''

}

const inputData = '' +
    '8\n' +
    '101000\n' +                    // yes
    '10111000101000\n' +            // no
    '1010001\n' +                   // no
    '10010011001001100\n' +         // no
    '101010000\n' +                 // yes
    '10010010010010010\n' +         // no
    '100100100100100101\n' +        // no
    '101000101000101000101000100';  // yes

writeOutput(inputData);