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

void XoaKhoangTrang(char s[100])
{	
	char *c=strstr(s,"  "); // tra ve dia chi cua hai khoang trang chinh giua dau tien minh gap
	printf("\n Do dai cua chuoi s ban dau vua nhap la %d", strlen(s));
	printf("\n Do dai cua chuoi c vua lay dia chi %d",strlen(c));
	while(c!=NULL)
	{
		int t=strlen(s)-strlen(c);
		for(int i=t;i<strlen(s);i++)
			s[i]=s[i+1];
		c=strstr(s,"  ");
	}
	if(s[0]==' ')
	s=s+1; //xoa khang trang dau chuoi
	int n=strlen(s);
	if(s[n-1]==' ')
		s[n-1]='\0';//xoa khoang trang cuoi chuoi

	printf("\n Chuoi s sau khi xu ly la ");puts(s);

}

void main()
{
	char s[100];
	printf("\n Nhap vao chuoi s ");gets(s);
	printf("\n Chuoi s vua nhap la ");puts(s);
	XoaKhoangTrang(s);
	getch();
}
