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

void mystrcat(char *a, char *b){

    int i, length_a = strlen(a), length_ab=strlen(a)+strlen(b)+1;
    char c[length_ab];

    for (i = 0; i < length_a; ++i){
    	c[i] = a[i];
    }
    for (i=length_a; i<length_ab; i++){
        c[i]=b[i-length_a];
    }
    printf("string1+string2: %s \n", c);
    //printf("string1+string2: %s%s \n", a,b);
}

int main(void){

	char string1[100];
	char string2[100];

	printf("Input string1 and string2\n");
	printf("string1:");
	scanf("%s", string1);
	printf("string2:");
	scanf("%s", string2);

	mystrcat(string1, string2);

	// printf("string1+string2: %s \n", mystrcat(string1, string2));
	// printf("string1+string2: %s \n", string1);

	return 0;

}