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input/code.cpp: In function 'int main(int, char**)':
input/code.cpp:13:9: warning: statement has no effect [-Wunused-value]
    for(j; j != i; j--)
         ^
input/code.cpp:8:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s", str);
                  ^

#include <stdio.h>
#include <string.h>
#include <stdlib.h>


int main(int argc, char *argv[]){
	char *str =(char *) calloc(1000, sizeof(char));
	scanf("%s", str);
	size_t j = 0;
	for(size_t i = 0; i < strlen(str); i++){
		if(str[i] == str[i + 1]){
			for(j = i + 1; str[j] == str[j - 1]; j++);
			for(j; j != i; j--)
				str[j-1] = str[j];

		}
	}
	printf("%s", str);
	free(str);

	return 0;
}

Test 1

Verdict: RUNTIME ERROR

*** Error in `input/code': double free or corruption (!prev): 0x000000000215c010 ***

Test 2

Verdict: RUNTIME ERROR

*** Error in `input/code': double free or corruption (!prev): 0x0000000001157010 ***

Test 3

Verdict: RUNTIME ERROR

*** Error in `input/code': double free or corruption (!prev): 0x000000000157d010 ***

Test 4

Verdict: RUNTIME ERROR

*** Error in `input/code': double free or corruption (!prev): 0x0000000000bd3010 ***

Test 5

Verdict: RUNTIME ERROR

*** Error in `input/code': double free or corruption (!prev): 0x0000000002307010 ***

Test 6

Verdict: RUNTIME ERROR

*** Error in `input/code': double free or corruption (!prev): 0x0000000001957010 ***

Test 7

Verdict: RUNTIME ERROR

*** Error in `input/code': double free or corruption (!prev): 0x00000000014b4010 ***

Test 8

Verdict: RUNTIME ERROR

*** Error in `input/code': double free or corruption (!prev): 0x00000000019b8010 ***

Test 9

Verdict: RUNTIME ERROR

*** Error in `input/code': double free or corruption (!prev): 0x0000000001e09010 ***

Test 10

Verdict: RUNTIME ERROR

*** Error in `input/code': double free or corruption (!prev): 0x0000000000a67010 ***