Need help debugging code (C++). Getting errors "C3861'Hash': identifier not found" and "C2660 'Index_Finder': function does not take 5 arguments".

Please Comment where error was fixed.

Attached code
#include<iostream>
#include <cstdlib>

using namespace std;

bool Linear_Probing(int array[], bool flags[], int MAX_SIZE, int number, int & collisions);
int Index_Finder(int number, bool flags[], int MAX_SIZE, int &collisions);

bool Linear_Probing(int array[], bool flags[], int MAX_SIZE, int number, int &collisions)
{
    int dummy_collisions = 0;
    int index = Index_Finder(number, flags, MAX_SIZE, dummy_collisions);

    if (index == -1)
        return false;

    else
    {
        collisions += dummy_collisions;

        array[index] = number;
        flags[index] = true;
        return true;
    }
}

int Index_Finder(int number, bool flags[], int MAX_SIZE, int &collisions)
{
    int index = Hash(number);

    if (index < MAX_SIZE && !flags[index])
        return index;

    if (index >= MAX_SIZE)
    {
        index = 0;

        if (!flags[index])
            return index;

        else
            collisions++;
    }

    else
    {
        collisions++;
    }

    int limit = index;

    return Index_Finder(flags, MAX_SIZE, ++index, limit, collisions);

}

int Index_Finder(bool flags[], int MAX_SIZE, int index, int limit, int &collisions)
{
    if (limit == index)
        return -1;

    if (index == MAX_SIZE)
        index = 0;

    if (!flags[index])
        return index;

    else
    {
        collisions++;
        return Index_Finder(flags, MAX_SIZE, ++index, limit, collisions);
    }
}


int Hash(int number)
{
    int first_digit = 0, last_digit = 0;
    bool first_time = true;

    while (number > 0)
    {
        if (first_time)
        {
            first_digit = number % 10;
            number -= (number % 10);
            number /= 10;
            first_time = false;
        }

        else
        {
            last_digit = number % 10;
            number -= (number % 10);
            number /= 10;
        }
    }

    return (first_digit + last_digit);
}

int main() {
    const int MAX_SIZE = 11;
    int collisions = 0;
    int array[MAX_SIZE];
    bool flags[MAX_SIZE];

    for (int i = 0; i < MAX_SIZE; i++) {
        array[i] = 0;
        flags[i] = false;
    }

    Linear_Probing(array, flags, MAX_SIZE, 67, collisions);
    Linear_Probing(array, flags, MAX_SIZE, 19, collisions);
    Linear_Probing(array, flags, MAX_SIZE, 3, collisions);
    Linear_Probing(array, flags, MAX_SIZE, 808, collisions);
    Linear_Probing(array, flags, MAX_SIZE, 337, collisions);
    Linear_Probing(array, flags, MAX_SIZE, 1, collisions);
    Linear_Probing(array, flags, MAX_SIZE, 86, collisions);
    Linear_Probing(array, flags, MAX_SIZE, 38, collisions);

    return 0;
}

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