\begin{array}{c} \color{#db1616}{\texttt{#khoadang09}} \end{array}
`@`$\texttt{C: }$

#include <stdio.h>
int main(){
    char a[100], b[100]; //string
    char *i = a, *j = b; //pointer
    //input string, data ending with a space
    scanf("%s",a);scanf("%s",b);
    //processing
    while(*i != '\0'){
        i++;
    }
    while(*j != '\0'){
        *i = *j;
        i++; j++;
    }
    *i = '\0';
    //output
    printf("%s",a);
}