pku--3981 给定字符串替换

#include "stdio.h"
#include "string.h"
int main()
{
char s[10000],str[10000];
int i,j,k,len;
while (gets(s))
{
len=strlen(s);
i=0;k=0;
while(i<len)
{
if(s[i]=='y'&&s[i+1]=='o'&&s[i+2]=='u'&&i<len-2)
{
str[k++]='w';str[k++]='e';
i=i+3;
}
else str[k++]=s[i++];
}
str[k]='/0';
puts(str);

}
return 0;
}