Loadrunner: How to insert a charactor(s) into a string

I want to replace the '\' into '\\' in one string, here is my implementation in Loadrunner:

 char * position;
 int i=0;
 int j=0;
 Char * SRanStatus2_backup;
 Char SRanStatus2[50]="abcc\dada-com";

 SRanStatus2_backup= (char *)malloc(50 * sizeof(char));

 memset(SRanStatus2, 0, sizeof(SRanStatus2));

 memset(SRanStatus2_backup, 0, sizeof(SRanStatus2_backup));

 position = SRanStatus2;

 while ((*position)!= NULL) {

  if ((*position)!='\\') { //if ((*position)!='\x07') {

   SRanStatus2_backup[j]=SRanStatus2[i];
   i++;
   j++;
  }
   
  else if ((*position)=='\\') { //else if ((*position)=='\x07') {
   SRanStatus2_backup[j]='\\';
   SRanStatus2_backup[j+1]='\\';
   j=j+2;
   i++;
  }

  position++;
 }

 SRanStatus2_backup[j]='\0';

 lr_save_string(SRanStatus2_backup, "CheckboxORD_2_backup");

 free(SRanStatus2_backup);
 free(SRanStatus2);

 return 0;