Simulate the realization of strlen() function

#include<stdio.h>
#include<stdlib.h>
int my_strlen(const char *str)
{
    int i = 0;
    int count = 0;
    while (str[i] != '\0')
    {
        count++;
        i++;
    }
    return count;
}

int main()
{
    char *str = "abcdef";
    int len = my_strlen(str);
    printf("%d\n", len);
    system("pause");
    return 0;
}