Get readable temperature on serial port ATmega32, C

[bitsurfer]

Hello,

I read a temperature from sensor 18b20 with ATmega32 like this:

    unsigned long i;
    unsigned char m;
    io_init();
    delay_ms((unsigned char)1600);
    ds1820_reset();
    while(1)
    {
        ds1820_start();
        i = ds1820_read_temp();
        i = (i * 1000) / 16;
        ... etc...

This temperature value in 'i' is then showed with 7 segment display in my board.
Now I would like to send it to seial port to read in PC.
I setup communication OK but cant convert long unsigned integer to string and send it like bytes, one by one.

My approach:

            int t;
            char temp[14] = {0};
            sprintf(temp, "%ld", i);

            for (t=0; t<strlen(temp); t++)
            {
                char *te;
                strncpy(te, temp[t], 1);
            }
            USARTWriteChar(13);
            USARTWriteChar(10);

Here I got compiling errors.
How to do that conversion and send bytes properly?

Exact error I get is:

C:\WinAVR-20100110\avr\lib\libc.a(vfprintf_std.o)||In function `vfprintf':| (.text.avr-libc+0xd4)||undefined reference to `__mulhi3'|
C:\WinAVR-20100110\avr\lib\libc.a(vfprintf_std.o)||In function `vfprintf':| (.text.avr-libc+0xe4)||undefined reference to `__mulhi3'|
||=== Build finished: 2 errors, 0 warnings (0 minutes, 0 seconds) ===|

I include <string.h> and <stdio.h> but compiler behaves like here is not sprintf?