Strings

#include <strings.h>

char message[] = "This is a message";
char buffer[100];
char *cp1, *cp2;

....for (cp1=buffer,cp2=message; *cp2!='\0'; *cp1++ = .*cp2++);
....*cp1 = '\0';

...strcpy(buffer, message);
...strcat(buffer, " of hope");

A string is an array of characters (bytes), terminated by a byte with value
....0 ('\0'). Alternatively, a string is a pointer to the first character of
....the array.

The string "This is a message" occupies 18 bytes --- 17 visible characters
....plus one byte that terminates the string.

There is a library of functions that manipulate strings. Be sure to #include
....<strings.h> before using it.