{
while(strstr(s,c)!=NULL)
{
int t=strlen(s)-strlen(strstr(s,c)),d=strlen(c);
if((s[t-1]==' '&& s[t+d]==' ')||(s[t-1]==' '&& t+d==strlen(s)))//truong hop tu giua va tu cuoi
strcpy(s+t-1,s+t+d);// s+t-1 la khoang trangif(s[t+d]==' '&& t==0)//truong hop xoa tu dau tien
strcpy(s,s+t+d+1);
}
puts(s);
}
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