#include <stdio.h>
int hmstosec(const char *hms) {
#define _(i) ((hms[i] - '0') * 10 + (hms[i + 1] - '0'))
  return _(0) * 3600 + _(3) * 60 + _(6);
#undef _
}
char *sectohms(char *buff, int sec) {
#define _(i, value) buff[i] = '0' + (value) / 10, buff[i + 1] = '0' + (value) % 10
  return _(0, sec % 86400 / 3600), buff[2] = ':', _(3, sec % 3600 / 60), buff[5] = ':', _(6, sec % 60), buff[8] = '\0', buff;
#undef _
}
char *f(char *buff, const char *hms) {
  return sectohms(buff,  hmstosec(hms) + 1);
}
int main() {
  char buff[32];
  printf("%s\n", f(buff, "00:00:00"));
  printf("%s\n", f(buff, "23:59:59"));
  return 0;
}
 

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