Function in C: How to create

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#include <stdio.h>
#include <cs50.h>
int main(void)
{
long creditcardno;
do
{
creditcardno = 
get_long("enter");
}
while (creditcardno <  0);
}


			

The above code accepts positive integers while taking input for credit card no.

The task is now to form a function my_function () that will perform the above task when called in the main function.

All that I can figure out is:

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#include <stdio.h>
#include <cs50.h>
long my_function (void);

			

Will the next line include int main (void) or that will not appear at all.

Is it possible that I form a different c file such as test.c that will include function definition only and this file be called in main function in credit.c. Or both possibilities are there. I can have function defined and called in the same file so that everything can be performed from credit.c file.

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