void main(){
    char name[20];
    scanf("%[^n]s",&name);
    printf("%s",name);
}

struct book { char name[20];};
main(){
    struct book buk[10];
    int i;
    for(i=0;i<3;i++)
    {
        printf("Enter name of book %d",i+1);
        scanf("%[^n]s",&buk[i].name);}
    }

char name[20];
scanf("%[^n]s",&name);

scanf("%[^n]",name);/* & is not needed as name itself address */

scanf(" %19[^n]",name); /* giving space before % prevents reading extra characters */

char *p = fgets(buk[i].name),sizeof(buk[i].name),stdin);
 if(p != NULL) {
      /* do some stuff */
 }