LeetCode #Reverse words in a string#

刚看到这个题目，手痒了．还挺有意思的．．．

#include <stdio.h>

int main()
{

char str[] = "Please reverse this string!";

printf("%s\n", str);

str_rev(str);

printf("%s\n", str);

return 0;
}

int str_rev(char *string)
{
if(!string)
{
return 0;
}

int ins_pos = 0;
int ch = 0;
int swap_time = 0;

int i = 0;
int j = 0;

int counter = 0;
int word    = 0;

for(i = 0, word = 1; string[i] != '\0'; i++)
{
if(string[i] == ' ')
{
word++;
}
}
counter = i;

for(j = 0, swap_time = 0, ins_pos = 0, ch = 0;
j < word - 1;
j++)
{
for(swap_time = 0; string[counter-1] != ' ';)
{
ch = string[counter-1];

for(i = counter - 1; i > ins_pos; i--)
{
string[i] = string[i-1];
}
string[ins_pos] = ch;
swap_time++;
}

ins_pos += swap_time;
ch = string[counter-1];

for(i = counter - 1; i > ins_pos; i--)
{
string[i] = string[i-1];
}
string[ins_pos] = ch;
ins_pos++;
}

return 0;
}