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请将代码补充完整。01 #include 02 #include 03 #include 0405 char getFileExtName(char );0607 int main()08 {09 char fname[255], extname;10 scanf("%s", fname);11 extname = getFileExtName(fname);12 printf(extname);13 free(extname);14 return 0;15 }1617 char getFileExtName(char filename)18 {19 int len = strlen(filename);20 int i = len - 1, size = 0, j = 0;21 char p = NULL;22 while(i >= 0)23 {24 if((filename+i) == '.');25 --i;26 }27 if(i < 0) return NULL;28 size = len-i;29 p = (char )malloc(sizesizeof());30 for(j = 0; j < size; j++)31 {32 (p+j)=filename[i+j+1];33 }34 *(p+j)=0;35 ;36 }

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