Write a C program that uses functions to insert a sub-string into a given main string from a given position.

//insert a sub-string into a given main string from a given position.
#include <stdio.h>
#include <string.h>

// Function to insert a substring into the main string at the given position
void insertSubstring(char *mainStr, const char *subStr, int position) {
    int i, mainLen, subLen;

    mainLen = strlen(mainStr);
    subLen = strlen(subStr);

    // Shift characters of mainStr to the right to make space for the substring
    for (i = mainLen - 1; i >= position; i--) {
        mainStr[i + subLen] = mainStr[i];
    }

    // Insert the substring at the given position
    for (i = 0; i < subLen; i++) {
        mainStr[position + i] = subStr[i];
    }
}

int main() {
    char mainStr[100], subStr[50];
    int position;

    // Input the main string, substring, and position
    printf("Enter the main string: ");
    scanf("%[^\n]%*c", mainStr);  

    printf("Enter the substring: ");
    scanf("%[^\n]%*c", subStr);  

    printf("Enter the position to insert the substring: ");
    scanf("%d", &position);

    // Check if the position is valid
    int mainLen = strlen(mainStr);
    if (position < 0 || position > mainLen) {
        printf("Invalid position.\n");
        return 1;
    }

    // Call the function to insert the substring
    insertSubstring(mainStr, subStr, position);

    // Print the modified string
    printf("Modified string: %s\n", mainStr);

    return 0;
}

Enter the main string: welcome to Glance
Enter the substring: Study
Enter the position to insert the substring: 11
Modified string: welcome to StudyGlance 

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