直接选择性输出即可

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

int main()
{
	int i = 0,j;
	char s[100];
	gets(s);
	while(s[i] != '\0')
	{
		j = i;
		if(s[j] == 'g' && s[j+1] == 'z' && s[j+2] == 'u')
			i = j+3;
		else
		{
			printf("%c",s[i]);
			i++;
		}
	}
	return 0;
}