Unresolved error in program

the code below has this error.

main.obj : error LNK2001: unresolved external symbol "void __cdecl BubbleSort(int * const,int)" (?BubbleSort@@YAXQAHH@Z)
Debug/Bubblesort2.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

What have I done wrong? Please help!

Code:

#include<iostream>
using namespace std;

void Swap(int& num1, int& num2);
void DisplayArray(int array[], int arraySize);
void BubbleSort(int array[], int arraySize);

int main(void)
{
	int ages[]={3,5,4,7};

	DisplayArray(ages, (sizeof ages/sizeof ages[0]));
	BubbleSort(ages, (sizeof ages/sizeof ages[0]));
	DisplayArray(ages, (sizeof ages/sizeof ages[0]));
	
	return(0);
}

void DisplayArray(int array[], int arraySize)
{
	for(int i=0; i<arraySize; i++)
	{
		cout << array[i];
		if(i!=arraySize-1)
		{
			cout << ',';
		}
	}
	cout << endl;
}

void Bubblesort( int array[], int n )
{
  for ( int i = 0; i < n-1; ++i )
    for ( int j = 1; j < n-i; ++j )
      if ( array[j-1] > array[j] )
        // Note the use here of swap()
        swap( array[j-1], array[j] );
}


void Swap(int &x, int &y)
{
  int z = x;
  x = y;
  y = z;
}

Just a small typo.

Change: void Bubblesort( int array[], int n )
To: void BubbleSort( int array[], int n )

Also with the Swap function.

Monster you are a STAR!! Cheers buddy .