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static const size_t#include <stddef.h>
#define COLS = 5;
static const size_t
#define ROWS = 7;
static int matrix[ROWS][COLS];

void init_matrix(int x) {
  for (size_t i = 0; i < COLS; i++) {
    for (size_t j = 0; j < ROWS; j++) {
      matrix[i][j] = x;
    }
  }
}

static const size_t#include <stddef.h>
#define COLS = 5;
static const size_t
#define ROWS = 7;
static int matrix[ROWS][COLS];

void init_matrix(int x) {
  for (size_t i = 0; i < ROWS; i++) {
    for (size_t j = 0; j < COLS; j++) {
      matrix[i][j] = x;
    }
  }
}

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

char* init_block(size_t block_size, size_t offset,
                 char *data, size_t data_size) {
  char* buffer = malloc(block_size);
  if (data_size > block_size || block_size - data_size > offset) {
    /* data won't fit in buffer, handle error */
  }
  memcpy(buffer + offset, data, data_size);
  return buffer;
}

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

char* init_block(size_t block_size, size_t offset,
                 char* data, size_t data_size) {
  char* buffer = malloc(block_size);
  if (NULL == buffer) {
    /* handle error */
  }
  if (data_size > block_size || block_size - data_size > offset) {
    /* data won't fit in buffer, handle error */
  }
  memcpy( buffer + offset, data, data_size);
  return buffer;
}