Why is the result of this C code 4196044?

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C

Hi. Im learning to code functions in C and was testing tis specifically:
When you use int test; in a function called example() that modifies the value of test and then in your main code you repeat the function example(). The value of test changes or keeps the same value.

So i was testing and wrote this code but the result is 4196044 which i dont understand why is that. My code was just suposed to add three to score by addding test. So in the first loop test is 3. So then i wanted to see if in the second loop test would be still 3 or it would be 6 meaning the variable test keeps its 3 value from the earlier loop and then adds another 3. Hope im making sense. thanks for reading.
The code is this ([C] test2.c - Pastebin.com[^])

What I have tried:

#include <cs50.h>
#include <stdio.h>
int addthree(int var);

int main(void)
{
    int result;
    int score = 9;
    for (int i = 0; i < 2;i++)
    {
    result = addthree(score);
    }
    printf("%i\n", result);
}

int addthree(int var)
{
    int test;
    for (int i=0; i < 3; i++)
    {
        test = test + i;
    }
    var = var + test;
    return var;
}