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input/code.cpp: In function 'int main(int, char**)':
input/code.cpp:7:39: error: invalid conversion from 'void*' to 'char*' [-fpermissive]
  char *str = calloc(1000, sizeof(char));
                                       ^
input/code.cpp:10:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < strlen(str); i++){
                               ^
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 = calloc(1000, sizeof(char));
	scanf("%s", str);
	int j = 0;
	for(int 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;
}