#include <stdio.h>

struct {
  char name[40];
  int age;
} person, person_copy;

char * strcpy1(char * dest, const char * src)
{
    char * p = dest;
    while(*src != '\0') {
        *p = *src;
        ++src;
        ++p;
    }
    *p = '\0';
    return p;
}

char * strcat1(char * dest, const char * src)
{
    char * p = dest;
    while(*p != '\0')
        ++p;
    while(*src != '\0') {
        *p = *src;
        ++src;
        ++p;
    }
    *p = '\0';
    return p;
}

size_t strlen1(const char * str)
{
    size_t s = 0;
    while(*str!='\0') {
        ++s;
        ++str;
    }
    return s;
}

int strcmp1(const char* str1, const char * str2)
{
    while(*str1!='\0' && *str2!='\0') {
        if(*str1 > *str2)
            return 1;
        else if(*str1 < *str2)
            return -1;
        ++str1;
        ++str2;
    }
    return 0;
}

void * memcpy1 (void * dest, const void * src, size_t num)
{
    char * p_dest = (char*) dest;
    char * p_src = (char*) src;
    size_t i;
    for(i = 0;i < num; ++i, ++p_src, ++p_dest)
    {
        *p_dest = *p_src;
    }
    return dest;
}


int main()
{
    char input[256] = "Test1";
    char input2[128] = "Test2";
    printf("%lu %lu\n", strlen1(input2), strlen(input2));
    puts(input);
    puts(input2);
    strcat1(input, input2);
    puts(input);
    puts(input2);
    char myname[] = "Andrzej Golota";
    memcpy1 ( person.name, myname, strlen1(myname)+1 );
    person.age = 50;
    memcpy1 ( &person_copy, &person, sizeof(person) );
    printf ("person_copy: %s, %d \n", person.name, person_copy.age );
    return 0;
}