#include <stdio.h>

void uppercase_ascii(char s[]) {
  for(int i = 0; s[i] != '\0'; i += 1) {
    if(s[i] >= 'a' && s[i] <= 'z') { s[i] -= 32; }
  }
}

/*
  main [
  | c: ["Hi class"]
  | c2: ["It's joe\0"]
  | < metadata about my program >
  ]
  
  Hi classIt'sjoe\0
  ^       ^
  c       c2

*/
int main() {
  char c[8] = { 'H', 'i', ' ', 'c', 'l', 'a', 's', 's' };
  int x = 33;
  char c2[] = { 'I', 't', ' ', 'm', 'e' };
  c[10] = 'Z';
  uppercase_ascii(c);
  printf("%s\n", c);
  printf("%s\n", c2);
}