Simple multithreading example befor bed )

#include <stdio.h>
#include <windows.h>
#include <process.h>         // needed for _beginthread()

struct sourcendest{
    char * source;
    char * destination;
};
void testfunc( void * arg );   // function prototype
void testfunc2( void * sd1 );


int main(){
    // Our program's first thread starts in the main() function.

    printf( "Now in the main() function.\n" );

    // Let's now create our second thread and ask it to start
    // in the testfunc() function.

    _beginthread( testfunc, 0, (void*)12 );

    // From here on there are two separate threads executing
    // our one program.

    // This main thread can call the testfunc() function if it wants to.

    testfunc( (void*)-5 );

    char c1[50] = "All heil Megatron!\0";
    char c2[50] = "Black patryvan is coming for you!\0";
    char c3[50] = "\0";
    char c4[50] = "\0";
    sourcendest * sd01, * sd02;
    sd01 = new sourcendest;
    sd02 = new sourcendest;
    sd01->source = c1;
    sd02->source = c2;
    sd01->destination = c3;
    sd02->destination = c4;
    printf("c1 = '%s'\nc2 = '%s'\nc3 = '%s'\nc4 = '%s'\n\n", c1,c2,c3,c4);
    testfunc2(sd01);
    _beginthread( testfunc2, 0, (void*)sd02 );
    Sleep( 1000 );
    printf("c1 = '%s'\nc2 = '%s'\nc3 = '%s'\nc4 = '%s'\n\n", c1,c2,c3,c4);

}

void testfunc( void * arg){
    printf( "The testfunc() function was passed %d\n", (INT_PTR)arg ) ;
}
void testfunc2( void * sd1 ){
    sourcendest * lsd1 = (sourcendest *) sd1;
    unsigned int i = 0;
    for (; lsd1->source[i] > 0; ++i){
        lsd1->destination[i]=lsd1->source[i];
    }
    lsd1->destination[i]=0;
}