Desafío de programación Count Digits

Problema

Count how many decimal digits n has when written normally, without leading zeros.

Implement count_digits(n).

n: A positive integer.

Return the number of digits.

1 ≤ n ≤ 10¹⁸

Ejemplo 1

Entrada:
n = 352

Salida esperada:
expected = 3

Entrada:
long long n = 352;

Salida esperada:
long long expected = 3;

Entrada:
long n = 352;

Salida esperada:
long expected = 3;

352 has three digits.

Ejemplo 2

Entrada:
n = 7

Salida esperada:
expected = 1

Entrada:
long long n = 7;

Salida esperada:
long long expected = 1;

Entrada:
long n = 7;

Salida esperada:
long expected = 1;

A single digit.