How to refine the code semantically ?

#include

#include

#define EXP 52

#define I 52

#define BUFFER_SIZE 1250

char* func_rec(char* v1, int i);

int main(int argc, char argv[]) {

int it_0 = 0;

int it_1 = 0;

int it_e = 0;

int it_x = 0;

int ctr = 0;

char* elem = NULL;

char** res = NULL;

FILE *pFile = NULL;

char *filename = "file.txt";

char buffer[EXP*EXP*I*I] = "";

int buffer_size = BUFFER_SIZE;

size_t str_length = 0;

pFile = fopen("file.txt", "w");

res = (char**) malloc(EXP*EXP*I*I*sizeof(char*));

elem = (char*) malloc(EXP*EXP*I*I*sizeof(char));

for(it_e = 1; it_e

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