#include <string.h>               <strng.h> ???

strdup                            operator =

strcpy                            operator =
strncpy                           substr
strntcpy                          substr

strcat                            operator +

strcmp                            operator ==
strncmp                           substr == substr
stricmp                           uppercase == uppercase
strnicmp                          substr uppercase == substr uppercase

strlen                            length

strupr                            uppercase
strlwr                            lowercase

strchr                            indexof
strrchr                           lastindexof
strstr                            indexof

strnpbk                           ???
strtok                            ???

memcpy                            operator =
memset                            ???

isdigit                           isdigit
isalpha                           isalpha
isprint                           isprint
isspace                           isspace

strip                             strip

strtol                            ???

strstrci                          ???

                                  ctors:
                                  string()
                                  string(char)
                                  string(char *)
                                  string(string &)
                                  string(char *buf, size_t len)