#include <iostream>
using namespace std;
char str1[20],str2[20],str3[20];
void myStrcat(char [],char []);
 
void myStrcat(char str1[],char str2[]){
	int c,d;
	 c = 0;
 
   while(str1[c] != '\0') {
      c++;  	
   }
 
   d = 0;
 
   while(str2[d] != '\0'){
      str1[c] = str2[d];
      d++;
      c++;	
   }
 
   str1[c] = '\0';
}
 
 
int main(){
	cout << "Enter first string: " << endl;
	cin >> str1;
	cout << "Enter secound string: " << endl;
	cin >> str2;
	myStrcat(str1,str2);	
	cout << "Result is " << str1 << endl;
}
 

   #include <iostream>
using namespace std;
void myStrcat(char [],char [],char []);
char str1[20],str2[20],str3[20];
void myStrcat(char str1[],char str2[], char str3[]){
	int c,d;
     c = 0;
 
	if((str1 != '\0') && (str2 != '\0')){
		str3 = str1;
		myStrcat(str1+1, str2, str3+1);
	}else if((str1 == '\0') && (str2 != '\0')){
		str3 = str2;
		myStrcat(str1+1, str2, str3+1);
	}
	str3[c] = '\0';
}
 
 
int main(){
	cout << "Enter first string: " << endl;
	cin >> str1;
	cout << "Enter secound string: " << endl;
	cin >> str2;
	myStrcat(str1,str2,str3);
	cout << "Result is " << str3 << endl;
}