Solution: Uppercase the String

#include <stdio.h>
char * toUpperCase(char * province)
{
  int i = 0; 
  while (province[i] != 0)  
  { 
    if ((province[i] >= 'a') && (province[i] <= 'z')) 
    {
      province[i] = province[i] - 32; 
    }
    i++;
  } 
  return province;
}
int main(void)
{
  char province[] = "Ontario";
  toUpperCase(province);
  printf("Uppercase: %s\n", province);
  return 0;
}