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while ( text[i] != '\0' )
{
text[i] = text[i] + (key);
if( text[i] > 'z' ) text[i] = text[i] - 'z' + 'a' - 1
i++;

}

typedef struct node2
{
int floornumber;
struct node1 *room; // use pointer to room header
struct node2 *nextfloor;
} floor;