C Saved Program: serene-mountain

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void remove_pair(char* input)
{
    int len = strlen(input);
    int i, j = 0;
    
    for (i=1; i <= len; i++)
    {
        //Cancel pairs
        while ((input[i] == input[j]) && (j >= 0))
        {
            i++;
            j--;
        }
        input[++j] = input[i];
    }
    return;
}
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