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The following function is a bit of code that I'm sure has been developed elsewhere already, but it hard to track down. It's a string replacement function which can be used in the code for titles, prompts, and travel messages. 

void strnrplc(char * src, char * fnd, char * rpl, long n) {
    char * out;
    char * curr;
    char * ptr;

    out = (char *) malloc(sizeof(char) * n);
    if ( out == NULL ) {
        return;
    }
    curr = src;
    ptr = strstr(src, fnd);
    out[0] = '\0';
    while ( ptr != NULL ) {
        strncat( out, curr, (ptr-curr+strlen(out)) < n ? (ptr-curr) : (n-strlen(out)-1) );
        strncat( out, rpl, (strlen(rpl)+strlen(out)) < n ? strlen(rpl) : (n-strlen(out)-1) );
        curr = ptr + strlen(fnd);
        ptr = strstr(curr, fnd);
    }
    strncat(out, curr, ((n-(curr-src))+strlen(out)) < n ? (n-(curr-src)) : (n-strlen(out)-1) );
    out[n-1] = '\0';
    strncpy(src, out, n);
    free(out);
}