Check bug and Modify bug in helper.js

```
const incrementString = (string) => {
// Convert pass args to string
const str = string.toString();
// Extract string's number
let number = str.match(/\d+/) === null ? 0 : str.match(/\d+/)[0];

// Store number's length
const numberLength = number.length;

// Increment number by 1
number = (parseInt(number) + 1).toString();

// If there were leading 0s, add them again
while (number.length < numberLength) {
number = '0' + number;
}

return str.replace(/[0-9]/g, '').concat(number);
};

export default incrementString;

```