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...
char *new_secret;
size_t size = strlen(secret);
if (size == SIZE_MAX) {
  /* Handle Error */
}

new_secret = malloc(size+1); 
if (!new_secret) {
  /* Handle Error */
}
strcpy(new_secret, secret);

/* Process new_secret... */

free(new_secret);
...

...
temp_buff = calloc(new_size,sizeof(char)); /* use calloc() to zero-out allocated space */
if (temp_buff == NULL) {
 /* Handle Error */
}

memcpy(temp_buff, secret buffer, buffersecret_size);
memset(buffer,'\0',buffersecret_size);         /* sanitize the buffer */

free(buffersecret);              
buffer
secret = temp_buff;                      /* install the resized buffer */
temp_buff = 0NULL;
...