Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void ao( char* num, int cur, double left, double sum, char* sol, char*** res, int* resEnd, int* resCap, int target ){
if( cur == strlen(num) && left * sum == target ){
if( *resEnd == *resCap ){
*resCap *= 2;
*res = realloc( *res, (*resCap) * sizeof( **res ) );
}
( *res )[ *resEnd ] = sol;
( *resEnd )++;
return;
}
if( cur == strlen(num) ){
return;
}
int oldLen = strlen( sol );
if( sum != 0 ){
char* newSol = calloc( oldLen, sizeof( *newSol ) );
strcpy( newSol, sol );
newSol[ oldLen ] = num[cur];
ao( num, cur+1, left, sum * 10 + ( num[ cur ] - '0' ), newSol, res, resEnd, resCap, target );
}
{
char* newSol = calloc( oldLen, sizeof( *newSol ) );
strcpy( newSol, sol );
newSol[ oldLen ] = '*';
newSol[ oldLen + 1 ] = num[cur];
ao( num, cur+1, left * sum, num[ cur ] - '0', newSol, res, resEnd, resCap, target );
}
{
char* newSol = calloc( oldLen, sizeof( *newSol ) );
strcpy( newSol, sol );
newSol[ oldLen ] = '+';
newSol[ oldLen+1 ] = num[cur];
ao( num, cur+1, 1, num[cur] - '0', newSol, res, resEnd, resCap, target - left * sum );
}
{
char* newSol = calloc( oldLen, sizeof( *newSol ) );
strcpy( newSol, sol );
newSol[ oldLen ] = '-';
newSol[ oldLen+1 ] = num[cur];
ao( num, cur+1, -1, num[cur] - '0', newSol, res, resEnd, resCap, target - left * sum );
}
free( sol );
}
char** addOperators(char* num, int target, int* returnSize) {
int resCap = 16;
char** res = calloc( resCap, sizeof( *res ) );
int resEnd = 0; // 0 .. resEnd-1 is the current result we have
int n = strlen( num );
if( n== 0 ){
return res;
}
char* sol = calloc( 2 * n - 1, sizeof( *sol ) );
memset( sol, '\0', 2 * n - 1);
sol[0] = num[0];
ao( num, 1, 1, num[0] - '0', sol, &res, &resEnd, &resCap, target );
*returnSize = resEnd;
printf("%c",res);
}
int main(){
char* num=123;
int target=1;
int* returnSize=1;
addOperators(num, target,returnSize);
}

I made this but i cant print it whats wrong