#include <iostream>
  #include <string>
  #include <cstring>
  using namespace std;
    
  void csReverse (char c[]) {
      // [!] Save the cstring size
      int size = strlen(c);
        
      // [!] We'll flip each character from the
      // front with the ones at the end, moving our
      // iterator inwards...
      // What should be our terminating condition?
      for (int i = 0; i < size / 2; i++) {
          // Save c[i] into a temp variable
          char holder = c[i];
            
          // [!] Set c[i] to the one on the end
          // (remember we're iterating inwards)
          c[i] = c[size - i - 1];
            
          // [!] Then set that equal to the holder
          c[size - i - 1] = holder;
      }
  }
      
  int main () {
      char c1[] = "testz";
      char c2[] = "!";
      char c3[] = "";
    
      csReverse(c1);
      csReverse(c2);
      csReverse(c3);
    
      cout << c1 << endl;
      cout << c2 << endl;
      cout << c3 << endl;
  }

  #include <iostream>
  #include <string>
  #include <cstring>
  using namespace std;
    
  const int MAX_CSTRING_SIZE = 20 + 1;
    
  /*
  * Appends cstring toAppend to each cstring in target
  */
  void multiCStringAppend (char target[][MAX_CSTRING_SIZE], char toAppend[], int n) {
      // Simply iterate through all n elements in
      // the target...
      for (int i = 0; i < n; i++) {
          // ...and append toAppend to each element
          strcat(target[i], toAppend);
      }
  }
      
  int main () {
      char c1[][MAX_CSTRING_SIZE] =
      {
          "test",
          "my",
          "function!"
      };
    
      multiCStringAppend(c1, " yay!", 3);
    
      for (int i = 0; i < 3; i++) {
          cout << c1[i] << endl;
      }
  }