string_concatination.c

#include <stdio.h>
int main() {
    
    char s1[100];
    scanf("%[^\n]%*c", s1);
    char s2[100];
    scanf("%[^\n]%*c", s2);
    int length, j;

    length = 0;
    while (s1[length] != '\0') {
        length++;
    }
    

    for (j = 0; s2[j] != '\0'; j++, length++) {
        s1[length] = s2[j];
    }
    
    s1[length] = '\0';
    
    printf("%s",s1);
    return 0;
}