custom strncat, strcmp and strncmp with pointers

i need to create 3 functions that immitate the built-in strncat, strcmp and strncmp functions in the cstring library.
i could probably do it with arrays, but i need to use pointers instead. could somebody lead me in the right direction?

thanks,
mike

strcmp(arg1,arg2)

If strings arg1 and arg2 are equal, it returns 0.

so u have to have a comparative if statement.

As for the pointers , can't you just use refrences?