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  1. #include <stdio.h>
  2. #include <stdint.h>
  3.  
  4. #define BASE    65
  5. /*
  6.  * A = 65 (Dec)     => 0
  7.  * z = 122 (Dec)    => 57 
  8.  */
  9.  
  10. static void
  11. process_string (char *str)
  12. {
  13.     char *ptr = str;
  14.     uint64_t map = 0; /* 64 bit integer */
  15.     int ascii = 0, ix = 0;
  16.  
  17.     while (*ptr != '\0') {
  18.         ascii = (int) *ptr;
  19.         ix = ascii - BASE;
  20.         if ((map & (1ULL<<ix)) == 0) {
  21.             *str++ = *ptr;
  22.             map = map | (1ULL<<ix); 
  23.         }
  24.         ptr++;
  25.     }
  26.     *str = '\0';
  27.     return;
  28. }
  29.  
  30. int main (void)
  31. {
  32.     char str[BUFSIZ] = "Geeksforgeeks";
  33.     printf("string: %s\n", str);
  34.     process_string(str);
  35.     printf("\nFinal string: %s\n", str);
  36.     return 0;
  37. }
Success #stdin #stdout 0s 2292KB
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stdin
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Standard input is empty
stdout
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string: Geeksforgeeks

Final string: Geksforg
https://ideone.com/8bQe5e
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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