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size_t str_size = calc_size(other_string);
char *str_copy = malloc(str_size);
strncpyif (str_copy == NULL) {
    /* handle error */
  }
strcpy(str_copy, other_string, str_size);

size_t str_size = calc_size(other_string);
if (str_size != 0) {
  char *str_copy = malloc(str_size);
  if (str_copy == NULL) {
    /* handle error */
 check return value}
  strncpystrcpy(str_copy, other_string, str_size);
}