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Why do I get unresolved external errors?

Shishykish (140)
Hello,

When compiling I get output about unresolved externals? I am not sure what is wrong with my code. 

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#include <iostream>

using namespace std;

struct nums
{
	int number;
	nums *ptr_to_next_num;
};

void display_integer(nums *);

int main()
{
	nums int1 = { 1 };
	nums int2 = { 2 };
	nums int3 = { 3 };
	nums int4 = { 4 };
	nums int5 = { 5 };

	nums *first;

	first = &int1;

	int1.ptr_to_next_num = &int2;
	int2.ptr_to_next_num = &int3;
	int3.ptr_to_next_num = &int4;
	int4.ptr_to_next_num = &int5;
	int5.ptr_to_next_num = NULL;

	display_integer(first);

	return 0;
}

void display_integers(nums *integer_set)
{
	while (integer_set != NULL)
	{
		cout << integer_set->number << endl;

		integer_set->ptr_to_next_num;
	}
	return;
}


Output

1>------ Build started: Project: Exercise13.4_2, Configuration: Debug Win32 ------
1>Exercise13.4_2.cpp
1>Exercise13.4_2.obj : error LNK2019: unresolved external symbol "void __cdecl display_integer(struct nums *)" (?display_integer@@YAXPAUnums@@@Z) referenced in function _main
1>C:\Users\Kish\Documents\Visual Studio 2017\Projects\Exercise13.4_2\Debug\Exercise13.4_2.exe : fatal error LNK1120: 1 unresolved externals
1>Done building project "Exercise13.4_2.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
Repeater (3046)
display_integer
display_integers

Spot the difference,
Shishykish (140)
DOH! I am just going to flay myself
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