#include <stdio.h>

int strlen(char *);

int main(void) {
    char *string = "A Piece of String";
    printf("%d", strlen(string));
    return 0;
}

int strlen(char *s) {
    int length = 0;
    int bool = 1;
    int count = 0;

    while(bool == 1) {
        if(s[count] != '\0') {
            length++;
        } else {
            bool = 0;
        }
        count++;
    }

    return length;
}