• Develop a solid understanding of C-strings, and how each std::string object is a wrapper around a C string

• Practice with pointer operations in C++, e.g. dereferencing, treating them as arrays (and vice versa), etc.

You may not use any #include directives. Rather, take this opportunity to write pure C++, without the use of any library functions/classes/etc. #ifndef CS19_C_STRINGS_H_ #define CS19_C_STRINGS_H_ namespace cs19 {

/** * Searches a C-string for any of a set of characters. * * @param haystack the string to search * @param char_list a string containing the set of characters for which to search * @return a pointer to the char in haystack that matches one of the chars in char_list, or nullptr * if no such char is found. */ const char *strpbrk(const char *haystack, const char *char_list) { // TODO } /** * Finds the last occurrence of a character in a string. * * @param haystack the string to search * @param needle the char to search for * @return a pointer to the last char in haystack that matches needle, or nullptr if no such char is * found. */ const char *strrchr(const char *haystack, const char needle) { // TODO }