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

int main(void) {
	char sntc[150]="merhaba dunyali nasilsin";
    const char *word="dunyali ";
    char *found;
    while((found=strstr(sntc,word))!=NULL)
        strcpy(found,found+strlen(word));
    printf("%s",sntc);
	return 0;
}