2分くらいで書いたsort関数

sort.c

#include <stdio.h>
#include <string.h>

void bubble(char* p) {
  const size_t len = strlen(p);
  for (size_t i = 0; i < len; i++) {
    for (size_t j = i+1; j < len; j++) {
      const char tmp0 = p[i];
      const char tmp1 = p[j];
      if (tmp0 > tmp1) {
        p[i] = tmp1;
        p[j] = tmp0;
      }
    }
  }
}

void insertion_sort(char* p) {
  const int len = strlen(p);
  for (int i = 1; i < len; i++) {
    int j = i;
    while ((j > 0) && (p[j-1] > p[j])) {
      const char tmp = p[j-1];
      p[j-1] = p[j];
      p[j] = tmp;
      j--;
    }
  }
}

int main() {
  char str[] = "431250";
  insertion_sort(str);
  printf("%s\n", str);
}