Write a program to create function to concate two strings.

#include<stdio.h>
#include<conio.h>
#include<string.h>
void concat(char [],char []);
int main()
{
char s1[25],s2[25];
printf("enter first string");
scanf("%s",s1);
printf("\n enter second string");
scanf("%s",s2);
concat(s1,s2);
}
void concat(char s1[],char s2[])
{
int len,i,j;
len=strlen(s1);
for(i=len,j=0;j<strlen(s2);i++,j++)
{
s1[i]=s2[j];
}
s1[j]='\0';
printf("%s",s1);
}