My issue
My code
// Update the '_' in the code below
#include <stdio.h>
#include <string.h>
#define MAX_LEN 1001 // maximum length of input string
int main() {
int t;
scanf("%d", &t);
char S[MAX_LEN]; // declare a character array to store the input string
for (int i = 0; i < t; i++) {
scanf("%s", S); // read in the input string
int len = strlen(S); // get the length of the input string
char X[MAX_LEN * 2]; // declare a character array to store the concatenated string
int j;
for (j = 0; j < len; j++) {
X[_] = S[_]; // copy S into X
}
int k;
for (k = 0; k < len; k++) {
X[_+_] = S[_]; // concatenate S with itself
}
X[j+k] = '\0'; // terminate the string
printf("%s\n", X); // output the concatenated string
}
return 0;
}
Learning course: C for problem solving - 1
Problem Link: CodeChef: Practical coding for everyone