#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#define SIZE 20
char* GetSameChars(char* str1, char* str2);

int main()
{
	char *string1, *string2;
	puts(GetSameChars(&string1, &string2));
	system("pause");

}
char* GetSameChars(char* str1, char* str2)
{
	char buffer1[SIZE], buffer2[SIZE];

	printf("Enter array number 1:\n");
	gets_s(buffer1, SIZE);
	str1 = (char*)malloc(strlen(buffer1) + 1);
	strcpy_s(str1,SIZE, buffer1);

	printf("Enter array number 2:\n");
	gets_s(buffer2, SIZE);
	str2 = (char*)malloc(strlen(buffer2) + 1);
	strcpy_s(str2, SIZE, buffer2);

	int i = 0;
	int j = 0;
	int k = 0;
	char *arr=0;
	while (1)
	{
		if (str1[i] == str2[j])
		{
			arr[k] = str2[j];
			k++;
			j++;
		}
		else
			i++;
		if (i == strlen(str1) || j == strlen(str2));
		break;
	}
	arr=(char*)malloc(k*sizeof(char));

	return arr;
}