text: #ifndef _STR_H_
  #define _STR_H_
  #include <unistd.h> /* for typedef of size_t */
  
  /* Part 1 */
  size_t StrGetLength(const char* pcSrc);
  char *StrCopy(char *pcDest, const char* pcSrc);
  int StrCompare(const char* pcS1, const char* pcS2);
  char *StrSearch(const char* pcHaystack, const char *pcNeedle);
  char *StrConcat(char *pcDest, const char* pcSrc);
  
  #endif /* _STR_H_ */