#include <stdio.h>
#include <assert.h>
size_t my_strlen(const char* arr)
{
assert(arr);
size_t count = 0;
while(*arr != '\0')
{
count++;
arr++;
}
return count;
}
int main () {
char arr[]="abcdef";
size_t ret = my_strlen(arr);
printf("%d ",ret);
return 0;
}