C++ Array, How should i fix my array, it needs to remove all multiples of a variable?

I Have to write a function, named filter, that removes all multiples of a variable named num from the given list by calling a function i have written earlier named remove. Here are my two functions. Remove works properly however filter does not. Any input would be nice and i would greatly appreciate it. The filter function is supposed to remove all multiples of num from the program using remove. It currently does nothing and i do not think it entering the loop properly. I Have to write a function, named filter, that