/* write a function change string that replace all
lowercase letters with character '&' and all other chars
remain the same 
write main to test your function  */

#include<stdio.h>
void changeString(char old_str[], char new_str[]);
#define SIZE 21

int main(){
	char old_str[SIZE], new_str[SIZE];
	printf("enter a string max 20 characters\n");
	scanf("%s",old_str);
	
	changeString(old_str, new_str);
	printf("new string is %s\n", new_str);
	return 0;
}

void changeString(char old_str[], char new_str[]){
	int i=0;
	while(old_str[i]!='\0'){
		if(old_str[i]>='a' && old_str[i]<='z'){
			new_str[i]='&';
			
		}
		else{
			new_str[i]=old_str[i];
		}
		i++;
	}
	new_str[i]='\0';
}