Horror Code - Loop And Re-loop

Some time ago, a colleague of mine told me to look at a function. It was something similar to this:

void foo(struct bar array[], unsigned int count)
{
        /* some initialization code */

        for (int i = 0; i < count; i++) {
                /* 30 rows of code
                   doing something with array[i]*/
        }

        for (int i = 0; i < count; i++) {
                /* other 20 rows of code
                   doing something with array[i]*/
        }

        /* some cleanup code */
}

At first, I thought that, in the first loop, some data needed by the second loop were calculated. But after a closer look, I found that this was not the case. Furthermore, I saw that the first five or six rows of both loops were the same.

The explanation is that the second loop has been added years later the first by a different developer that didn't want to waste time in understanding what the first loop did. You may not like it, but it works, unless you have performance issues. Personally, I think there are funnier ways to make two loops in a row.