Replace function used Vugen scripts

char *strSource;

void Replace( char *strSource, char *strFrom, char *strTo, char *strParam)

{

   char strTemp[1024];

char *s= (char *)strSource;

int i=0;

int iLenFrom = strlen (strFrom);

int iLenTo = strlen(strTo);

while(*s)

{

if(strncmp (s,strFrom, iLenFrom) ==0)

{

strncpy(&(strTemp[i]), strTo, iLenTo);

i+=iLenTo;

s+ =iLenFrom;

}

else

{

  strTemp[i++] =*s;

s++;

}

}

strTemp[i] =0;

lr_save_string(strTemp,strParam);

}

//how  to call replace function

strSource= lr_eval_string("{c_ESS}");

lr_save_string(strSource,"c_ESS_New");

Replace(strSource,"&#x21", "!","c_ESS_New");