#include <stdio.h>


size_t my_strlen(const char *str) {
    size_t len = 0;
    while (*str++) {
        len++;
    }
    return len;
}


char* my_strcpy(char* dest, const char* src) {
    char* original_dest = dest;
    while ((*dest++ = *src++)) {
    
    }
    return original_dest;
}

int main() {
   
    char test_string[] = "Hello, world!";
    
   
    char polish_string[20];

   
    my_strcpy(polish_string, "Witaj, świecie!");

   
    size_t length_original = my_strlen(test_string);

    
    size_t length_polish = my_strlen(polish_string);

    size_t debug_length_original = length_original;
    size_t debug_length_polish = length_polish;

    return 0;
}