Print balanced parenthesis given n

// open - if open < n
// close - if close < n and close < open

#include<stdio.h>

void printparenthesisRecur(int n,int open,int close,char *str,int len){
if(len == 2*n){
str[len] = '\0';
printf("%s\n",str);
}
if(open < n){
str[len++] = '(';
printparenthesisRecur(n,open+1,close,str,len);
len--;
}
if(close < n && close < open){
str[len++] = ')';
printparenthesisRecur(n,open,close+1,str,len);
len--;
}
}

void printparenthesis(int n){
static char *str;
str = (char *)malloc(sizeof(char)*(2*n+1));
printparenthesisRecur(n,0,0,str,0);
}

int main(){
int n;
scanf("%d",&n);
printparenthesis(n);
return 0;
}