// We did not go through this example in the lecture
// It combines 2 strings together with a space in the middle
// and shows the use of strncat
// strncat will make

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

#define MAX_LEN 10

void remove_trailing_nl(char s[]);

int main(void) {
    // All initialised to empty strings;
    // They will be arrays filled with '\0' characters
    char first_name[MAX_LEN] = "";
    char last_name[MAX_LEN] = "";
    char full_name[MAX_LEN * 2] = ""; 

    // Read first name and last name
    printf("Enter first name: ");
    fgets(first_name, MAX_LEN, stdin);
    remove_trailing_nl(first_name);

    printf("Enter last name: ");
    fgets(last_name, MAX_LEN, stdin);
    remove_trailing_nl(last_name);
    

    // Manually concatenate first name and last name with a space in between
    // Append first_name to full_name.
    strncat(full_name, first_name, MAX_LEN * 2 - 1); 
    // Add space character
    strncat(full_name, " ", MAX_LEN * 2 - strlen(full_name) - 1); 
    // Append last_name
    strncat(full_name, last_name, MAX_LEN * 2 - strlen(full_name) - 1); 
    
    // Output the full name
    printf("Full name: %s\n", full_name);

    return 0;
}

// Remove the trailing newline character of the string
// if it exists
void remove_trailing_nl(char s[]) {
    int len = strlen(s);
    if (s[len - 1] == '\n') {
        s[len - 1] = '\0';
    }
}