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Thank you for that. I have made a few adjustments, however, it still isn't working as planned. Because the following error message won't let me compile it:
invalid operands to binary & (have 'int *'...

#include <stdio.h>
#include <string.h>
int main (int argc, char *argv[]) {

int i=0;
int input=0;
char str1[i];
char str2[i];
int n;