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  1. #include<stdio.h>
  2. #include<string.h>
  3.  
  4. char * doubles(char * s, char c)
  5. {
  6.     int cnt = 0;
  7.     for(const char * t = s; *t; ++t)
  8.         if (*t == c) ++cnt;
  9.     char *q = s + strlen(s) - 1,
  10.          *t = s + strlen(s) + cnt;
  11.     *t-- = 0;
  12.     while(q >= s)
  13.     {
  14.         if (*q == c) *t-- = c;
  15.         *t-- = *q--;
  16.     }
  17.     return s;
  18. }
  19.  
  20.  
  21. int main()
  22. {
  23.     char s[40] = "Hello, world";
  24.     printf("%s\n",doubles(s,'l'));
  25. }
  26.  
Success #stdin #stdout 0s 5332KB
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stdin
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Standard input is empty
stdout
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Hellllo, worlld
https://ideone.com/6FsjRe
language:
C (gcc 8.3)
created:
1 year ago
visibility:
secret

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