The string.h include file will support strcpy(string1, string2), where both of these strings are names of char arrays.
Of course, it's also easy to roll your own.
Remember that a string is not just a bunch of char's in a row. It MUST have an end of string char at it's end to be treated properly (and considered elevated to a true string): '\0'.
Might be a normal starting point if you wanted to not #include <string.h> and use strcpy().
while((c = string1[i]) != '\0')
string2[i] = string1[i++];