mystrcat

/*   Writing own version of the "   strcat( )   "  library function which is named mystrcat( )   */
#include<stdio.h>
void mystrcat(char s1[],char s2[]);
int main(void)
{
    char a[999999];
    char b[999999];
    gets(a);
    gets(b);
    mystrcat(a,b);
    return 0;
}
void mystrcat(char s1[],char s2[])
{
    char s3[80];
    int i,j;
    for(i=0;s1[i]!='\0';i++)
    {
        s3[i]=s1[i];
    }
    for(j=0;s2[j]!='\0';j++)
    {
        s3[i]=s2[j];
        i++;
    }
    s3[i]='\0';
    puts(s3);
}