I would like to know how to write the contents of a given function based on the following conditions.

Program requirements

1. Definition of structure fraction (with int type member variables numer and denom)

2. Create a function mul that multiplies fractions

・ The arguments of the function mul are the variables a and b of the structure fraction type.
-The return value of the function mul is the result of multiplication a * b in the meaning of a fraction (however, it is not necessary to divide it)

3. Create a print function to display the value of the structure fraction type

-The argument of the function print is the variable a of the structure fraction type.
-The return value of the function print is none.
Example: If 1/3, display as 1/3.

4. Prepare a variable of the appropriate structure fraction type in the main function, and check whether the function mul works properly using the print function.

Applicable source code

#include<stdio.h>
typedef struct fraction {
    int numer;
    int denom;
};
int mul () {
}
void print () {
}

int main () {
}

I've worked on the code myself, but I don't understand how to put structure arguments because there are multiple parts that I don't understand.