C and pointer Chapter 6 Question 2

/*  * C and pointer. Chapter 6: The second question deletes a part of a string, for example, abcdefg. If fgh, CDF, and xabc are input, the deletion fails. If CDE is input, the deletion is successful, get the abfg deletion function prototype: int del_substr (char * stre, char const * substr) stre is the source string to be operated, and substr is the substring to be deleted.  */  # Include <Stdio. h> # Include <Stdlib. h> Int Del_substr ( Char * Stre, Char   Const * Substr ){  Char * STR = Stre; Char * Source = STR;  Char   String = * Source;  Char   Const * Sub_str;  While ( String ! = '  \ 0  '  ) {Sub_str = Substr; While (* Sub_str! = '  \ 0  ' && String ! = '  \ 0  ' & * Sub_str = String  ) {Sub_str ++ ;  String = * ++ Source ;}  If (* Sub_str ='  \ 0  '  ){  //  Matched !!              While (* Source! = '  \ 0  '  ){ * STR ++ = * Source ++ ;}  While (* Str! = '  \ 0 '  ){ * STR ++ = '  \ 0  '  ;}  Return   1  ;} Str ++ ; Source = STR;  String = * Source ;}  Return   0 ;}  Int  Main (){  Char Source [ 100  ];  Char * SRC;  Char Chars [ 100  ]; Printf (  "  Enter a source string: \ n  "  ); Gets (source );  While (1  ) {SRC = & Source; printf (  "  Enter a string to be deleted: \ n  "  ); Gets (chars );  Int Flag = Del_substr (SRC, chars );  If (Flag = 0  ) {Printf (  "  An error occurred while deleting the matched items !! No matching string found !! \ N "  );  Continue  ;} Printf (  "  Matched and deleted !! : \ N  "  ); Printf (  "  % C  " ,* Source );  While (* ++ SRC! = '  \ 0  ' ) Printf (  "  % C  " ,* SRC); printf (  "  \ N  "  );  Break  ;}  Return   0  ;}