“student a am i”的倒置

问题：如何实现student a am i转换成为i am a student？

解析：可将语句完全倒置，成为i ma a tneduts，再将逐个单词倒置，成为i am a student

#include <stdio.h>#include <string.h>void reverse_string(char *l, char *r){while (l < r){char tmp = *l;*l = *r;*r = tmp;l++;r--;}}void reverse(char ch[], int len){int i = 0;char *ctmpl = ch;char *ctmpr = ch;while (ch[i]){if (ch[i] == ' '){reverse_string(ctmpl, ctmpr-1);ctmpl = ++ctmpr;}else{ctmpr++;}i++;}reverse_string(ch, ch + len - 1);}int main(){char ch[] = "student a am i";reverse(ch,strlen(ch));printf("%s\n", ch);}