请将代码补充完整。01 #include02 #include03 #include04 #define N 5005 int main()06 {07 char x, s[N];08 int i, c = 0;0910 gets(s);11 scanf("%c", &x);1213 for (i = 0;; i++)14 if ()15 s[c++] = s[i];16 s[c] = '\0';1718 puts(s);19 return 0;20 }