Function            strcapital - capitalizes the first letter of each
                                     word in a string

  Syntax              char *strcapital(char *str);

  Prototype in        stringhk.h

  Remarks             strcapital capitalizes the first letter of each
                      word in the string str. A word is defined an an
                      alphabetic sequence of letters. The string passed
                      to strcapital is modified.

  Return value        returns str.