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  1. #include <stdio.h>
  2.  
  3. char *merge_spaces(char *str) {
  4. 	char *saved_str, *pos;
  5. 	saved_str = pos = str;
  6. 	bool prev_was_ch = false;
  7. 	while (*str) {
  8. 		if (*str != ' ' || prev_was_ch) {
  9. 			*pos++ = *str;
  10. 			prev_was_ch = *str != ' ';
  11. 		}
  12. 		str++;
  13. 	}
  14. 	pos[-(!prev_was_ch && pos != saved_str)] = '\0';
  15. 	return saved_str;
  16. }
  17.  
  18. int main(void) {
  19. 	char str[] = "  hello   world this  is          a test  ";
  20. 	printf("[%s]\n", merge_spaces(str));
  21. 	return 0;
  22. }
  23.  
Success #stdin #stdout 0s 4528KB
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Standard input is empty
stdout
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[hello world this is a test]
https://ideone.com/XWvaIE
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
secret

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