These libraries have been adapted from the standard set where possible or from subsets as is the case with printf.

  included with    #include "string.h"

String Functions
    strcat
    strchr
    strcmp
    strcpy
    strcspn
    strlen
    strncat 
    strncmp 
    strncpy 
    strstr 
    strrchr 
    islower 
    isupper 
    toupper 
    tolower