#include<stdio.h>

char* strcatt(char[], char[]);

int main(void) {
    char S1[] = "University of Colombo";
    char S2[] = "Sri Lanka";
    printf("%sn", strcatt(S1, S2));
return 0;
}

char* strcatt(char S1[], char S2[]) {
    int i = 0, j = 0;
    while(S1[i]) {
        i++;
    }
    S1[i++] = ' ';
    while(S1[i] = S2[j]) {
        i++;
        j++;
    }
return (S1);
}

char * strcatt( char s1[], const char s2[] )
{
    size_t i = 0, j = 0;

    while ( s1[i] ) i++;

    s1[i++] = ' ';

    while ( s1[i] = s2[j] )
    {
        i++;
        j++;
    }

    return s1;
}

char S1[32] = "University of Colombo";