WRITE A C PROGRAM to concatinate of two string

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

int main()
{
    char a[100], b[100];
   
    printf("Enter the first string\n");
    gets(a);
   
    printf("Enter the second string\n");
    gets(b);
   
    strcat(a,b);
   
    printf("String obtained on concatenation is %s\n",a);
   
    return 0;

}