[sqlite] extension don't return value

[dark0s dark0s]

The soundex function don't return results of your processing.
My output is below:
bash-3.1# gcc -shared labsinf.c -o inf.so
bash-3.1# sqlite3
SQLite version 3.5.7
Enter ".help" for instructions
sqlite> select load_extension('/root/inf.so')
   ...> select inf(savio)
   ...> 

I don't understand where is the problem? in sqlite3_result_text function or in 
sqlite3_create_function

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sqlite3ext.h>
SQLITE_EXTENSION_INIT1

void soundex(sqlite3_context* ctx, int nargs, sqlite3_value** values) {

  int i,j;
  char c,r;
  int d;
  int count;
  char* str2;
  char* result;
  int dim;
  const char* str;
  char ret[4];
  
  str = sqlite3_value_text(values[0]);
  dim = strlen(str);
  for (i=0;i<dim;i++) str2[i] = str[i];
  for (i=0;i<=dim;i++) str2[i] = toupper(str2[i]);
  for (i=0;i<=dim;i++) 
    switch (str[i]) {
      case 'A': case 'E': case 'I': case 'O':
      case 'U': case 'H': case 'W': case 'Y': str2[i] = '0';
    }
  for (i=1;i<dim;i++) 
    switch (str2[i]) {
      case 'B': case 'F':
      case 'P': case 'V': str2[i] = '1'; break;
      case 'C': case 'G':
      case 'J': case 'K':
      case 'Q': case 'S':
      case 'X': case 'Z': str2[i] = '2'; break;
      case 'D': case 'T': str2[i] = '3'; break;
      case 'L': str2[i] = '4'; break;
      case 'M': case 'N': str2[i] = '5'; break;
      case 'R': str2[i] = '6'; break;
    }
  
  count=1;
  for (i=0;i<dim-1;i++)
    if (str2[i] != str2[i+1]) count++;
  result = malloc(count);
  j=0;
  for (i=0;i<dim-1;i++)
    if (str2[i] != str2[i+1]) {
      result[j]=str2[i];
      j++;
    }
//  for (i=0;i<4;i++) printf("%c", result[i]);
  for (i=0;i<4;i++) ret[i] = result[i];

  printf("\n\n");
  sqlite3_result_text(ctx,(const char*)result, strlen(result), 
SQLITE_TRANSIENT);

}


int sqlite3_extension_init(sqlite3 *db, char **pzErrMsg, const 
sqlite3_api_routines *pApi) {
  SQLITE_EXTENSION_INIT2(pApi)
  sqlite3_create_function(db, "soundex", 1, SQLITE_UTF8, NULL, soundex, NULL, 
NULL);
  return 0;

}

Thank you in advance to help

       
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