I want a string length multiple of 8 and remove any extra digits in the string

I want a string to return a length of multiple of 8 for example if I’ve 123456789
so here I need to return a string 12345678 removing the last digit
Example 2:
for instance string length is 123456789123=>here it should remove 9123 and return me 1234
5678

I’m returning a string length when I pass the length of string to be 8 the length that are not multiple of 8 I should make them multiple of 8 by removing the exessive characters

>Solution :

You can start with this example:

function getStringMultipleOfEight(str) {
  const remainder = str.length % 8;
  const newLength = str.length - remainder;
  return str.substring(0, newLength);
}

console.log(getStringMultipleOfEight('123456789')); // Output: '12345678'
console.log(getStringMultipleOfEight('123456789123')); // Output: '12345678'