Simple implemenation for C strlen

// str_len.c.c 
#include <stdio.h>
size_t strlen(char*);

int main(void)
{
    char* name = "ThisIsAStringLiteral";
    printf("%u\n", strlen(name));
    return 0;
}

size_t strlen(char *str){
    auto unsigned long n=0;
    while (*str++) n++;
    return ++n;        // for '\0'
}