View Compilation Error

0_0_20531996_28659.cpp:20:1: error: prototype for 'int cstring::cstrcpy(char*&, const char*)' does not match any in class 'cstring'
 cstring::cstrcpy(char *&a,const char *b)
 ^
0_0_20531996_28659.cpp:10:10: error: candidate is: void cstring::cstrcpy(char*&, const char*)
     void cstrcpy(char *&a,const char *b);
          ^