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/*
contcat to string.
*/
#include <stdio.h>
#include <string.h>

int main() {
	char string1[20],
		string2[20];
	int i, j;

	//init the string to NULL values
	memset(string1, 0, 20);
	memset(string2, 0, 20);

	//user input
	printf("Enter the first string: ");
	scanf("%s", string1);

	printf("\nEnter the second string: ");
	scanf("%s", string2);

	//display string.
	printf("\n");
	printf("First String: %s\n", string1);
	printf("Second String: %s", string2);
	
	//length of the first string.
	i = strlen(string1);

	//travarse the second string and add to first string.
	for (j = 0; string2[j] != '\0'; j++) {
		string1[i++] = string2[j];
	}

	string1[i] = '\0';
	printf("\nContacating string: %s\n", string1);

	return 0;
}