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Write C Program to Insert Substring at Specific Location

// C Program to Insert Substring at Specific Location

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int main()
{
	char S1[50], S2[15];
	int index, i, l1, l2;

	printf("Enter String :--> ");
	gets(S1);

	printf("Enter Substring :--> ");
	gets(S2);

	printf("Enter Index :--> ");
	scanf("%d", &index);

	l1 = strlen(S1);
	l2 = strlen(S2);

	if(index > l1)
	{
		printf("Invalid Index");
		exit(0);
	}
	for(i = l1;i >= index; i--)
		S1[i + l2] = S1[i];
	for(i = 0;i < l2; i++)
		S1[index + i] = S2[i];


	printf("\nAfter Insertion :--> %s", S1);
}

Output:

Enter String :--> Hi  CodeCrucks
Enter Substring :--> and Hello
Enter Index :--> 3

After Insertion :--> Hi and Hello CodeCrucks