使用c实现按单词进行字符串反转

简陋实现版本,不考虑复杂情况
input: hello my book
output: book my hello

#include "stdio.h"
#include "stdlib.h"
#include "string.h"

void reverse_chars(char *src, int start, int length) {
	char *start_ptr = src + start;
	for(unsigned int i = 0;i < length / 2; i++) {
		char temp = *start_ptr;
		*start_ptr = *(start_ptr + (length -1 - 2 * i));
		*(start_ptr + (length -1 - 2 * i)) = temp;
		start_ptr++;
	}
}

int main() {
	char origin_words[] = "hello my book";
	int words_length = strlen(origin_words);

	reverse_chars(origin_words, 0, words_length);

	int last_index = 0;
	for(unsigned i=0;i<=words_length;i++) {
		if(*(origin_words + i) == ' ' || *(origin_words + i) == '\0') {
			reverse_chars(origin_words, last_index, i - last_index);
			last_index = i + 1;	
		}
	}
	
	printf("%s \n", origin_words);
}