C :: Transferring Contents Of One Character Array To Another Function

In the function *expandArrayList and *trimArrayList I need to allocate either more memory or less memory to the given array. Right now I am using malloc on a new array and then transferring the elements of the original array to the new array, freeing the original array, and then reassigning it to the new array so it's size and capacity are either bigger or smaller than the original. I feel like there has to be a simpler way to do this with either realloc or calloc, but I cant find sufficient information on either online. Would I be able to use either to make this easier and the code cleaner?

Also, these are character arrays that contain several character arrays inside them, so I was wondering what the best way to transfer the contents of one array to the other would be. I have gone between

Code:

//example
for (i=0; i<length; i++){
newarray[i] = oldarray[i];
}
and
Code: for (i=0; i<length; i++){
strcpy(newarray[i], oldarray[i]);
}

but I'm not sure which one (if either) should work.

The 'ArrayList.h' file that is included contains the structure ArrayList, as well as the function prototypes for the functions listed below.

Here is the structure in ArrayList.h:

Code:

#define DEFAULT_INIT_LEN 10
typedef struct ArrayList {
// We will store an array of strings (i.e., an array of char arrays)
char **array;

[Code] ....

Here is my code:

Code:

//included libraries
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ArrayList.h"
//Create arraylist

[Code]....