70. Implement Custom strlen Function

In C, strings are terminated by a null character '\0'. Your task is to implement a custom strlen() function that calculates the length of a string without using any built-in functions.

You will be given a string of maximum of 100 characters. Return the number of characters before the null terminator.

Example-1

Input: "Embedded"
Output: 8

Example-2

Input: "C is powerful"
Output: 13

Example-3

Input: ""
Output: 0