Undefined reference to a function

[MaxwellG]

Hello, everyone. I'm sorry if this is a really dumb question, but I just started
learning C++ today, so cut me some slack please :).

The error is this:

obj\Debug\src\calc.o||In function `main':|
C:\Users\Max\Desktop\C++\calculator\src\calc.cpp|34|undefined reference to `multiply(int)'|
||=== Build finished: 1 errors, 0 warnings (0 minutes, 0 seconds) ===|

And this is my code:

#include <iostream>
using namespace std;

void add(int s);
void subtract(int d);
void multiply(int p);
void divide(int q);

int main () {

    //variables
    int x; int y; int s; int p; int q; int d;

    //user input
    cout << "Enter an integer. \n";
    cin >> x;

    cout << "Enter another integer. \n";
    cin >> y;

    /* These are the variables that
    the functions will use */

    s = x + y;
    p = x * y;
    q = x / y;
    d = x - y;

    // Calling the functions

    add(s);
    subtract(d);
    multiply(p);
    divide(q);

    return 0;
}

void add(int s) {
    cout << "The sum is " << s << endl;
}
void mutiply(int p) {
    cout << "The product is " << p << endl;
}
void subtract(int d) {
    cout << "The difference is " << d << endl;
}
void divide(int q) {
    cout << "The quotient is " << q << endl;
}

What's wrong with this, and how do I fix it?
Thanks for your help!

[3TXyhbRD]

Just a small typo.

At line 6 you have void multiply(int p);
At line 42 you have void mutiply(int p);

[MaxwellG]

Thanks! Haha wow I must have missed the lack of an l.