C and pointer Chapter 6 first question

/*  * C and pointer. In chapter 6, the first question is to find the characters that appear in a specific character set. Basic Idea: match the first character of any character in the Chars string in source.  */  # Include <Stdio. h> # Include <Stdlib. h> Char   Const * Find_char ( Char   Const * Source, Char   Const * Charz ){  Int A = 0 ;  Char   Const * Src = Source;  Char   String = * SRC;  While ( String ! = '  \ 0  '  ){  Char   Const * Chars =Charz;  For (; * Chars! = '  \ 0  '  ;){  If (* Chars ++! = String ) Continue  ;  Else  { = 1  ;  Break ;}}  If (A = 1  ){  Return  SRC ;}  Else  {  String = * ++ SRC ;}}  Return  NULL ;}  Int Main ( Void  ){ Char Source [ 100  ];  Char Chars [ 100  ];  Char   Const * SRC; printf (  "  Enter a source string: \ n  "  ); Gets (source );  While ( 1 ) {Printf (  "  Enter a search string: \ n  "  ); Gets (chars); SRC = Find_char (source, chars );  If (Src = Null) {printf (  "  Matching failed !! : \ N  "  );  Continue  ;} Printf (  " Matched !! : \ N  "  ); Printf (  "  % C  " ,* SRC );  While (* ++ SRC! = '  \ 0  '  ) Printf (  "  % C  " ,* SRC); printf ( "  \ N  "  );}  Return   0  ;}