EP 02 - caesar cipher

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

void caesarCipher (int n, char str[]);

int main() {
  int n;
  char str[50];
    
  scanf ("%d", &n);
  caesarCipher (n, str);
    
  return 0;
}

void caesarCipher (int n, char str[]) {
  int pos;
  char s[50];
    
  for (int i = 0; i < n; i++) {
    scanf ("%s[^\n]", s);
    scanf ("%d", &pos);
  
    for (int j = 0; j < strlen(s); j++) {
      if (s[j]-pos < 65)
        s[j] += 26 - pos;
      else
        s[j] -= pos;
      
      str[j] = s[j];
      printf ("%c", str[j]);
    }
    printf ("\n");
  }
}