diff --git a/source/libs/index/inc/index_fst.h b/source/libs/index/inc/index_fst.h
index b26bd227f828969db17b6731b5ffbf1d7b06ff32..a1d4962e8be815847ca1a25689588dcb157c318f 100644
--- a/source/libs/index/inc/index_fst.h
+++ b/source/libs/index/inc/index_fst.h
@@ -26,10 +26,24 @@ extern "C" {
 #include "index_fst_counting_writer.h"
 #include "index_fst_automation.h"
 
+#define OUTPUT_PREFIX(a, b) ((a) > (b) ? (b) : (a) 
 
+typedef struct Fst     Fst;
 typedef struct FstNode FstNode;
-#define OUTPUT_PREFIX(a, b) ((a) > (b) ? (b) : (a) 
 
+typedef enum { Included, Excluded, Unbounded} FstBound; 
+
+typedef struct FstBoundWithData {
+  FstSlice data; 
+  FstBound type;
+} FstBoundWithData;
+
+typedef struct FstStreamBuilder {
+  Fst *fst; 
+  AutomationCtx *aut;
+  FstBoundWithData *min;  
+  FstBoundWithData *max;
+} FstStreamBuilder, FstStreamWithStateBuilder;
 
 typedef struct FstRange {
   uint64_t start;
@@ -39,16 +53,9 @@ typedef struct FstRange {
 
 typedef enum {GE, GT, LE, LT} RangeType;
 typedef enum { OneTransNext, OneTrans, AnyTrans, EmptyFinal} State;
-
 typedef enum {Ordered, OutOfOrdered, DuplicateKey} OrderType;
 
 
-typedef enum { Included, Excluded, Unbounded} FstBound; 
-typedef struct FstBoundWithData {
-  FstSlice data; 
-  FstBound type;
-} FstBoundWithData;
-
 FstBoundWithData* fstBoundStateCreate(FstBound type, FstSlice *data);
 bool fstBoundWithDataExceededBy(FstBoundWithData *bound, FstSlice *slice);
 bool fstBoundWithDataIsEmpty(FstBoundWithData *bound); 
@@ -60,8 +67,6 @@ typedef struct FstOutput {
   Output out;
 } FstOutput;
 
- 
-
 /*
  * 
  * UnFinished node and helper function
@@ -275,6 +280,8 @@ FstNode*     fstGetRoot(Fst *fst);
 FstType      fstGetType(Fst *fst); 
 CompiledAddr fstGetRootAddr(Fst *fst);
 Output       fstEmptyFinalOutput(Fst *fst, bool *null);
+FstStreamBuilder *fstSearch(Fst *fst, AutomationCtx *ctx);
+FstStreamWithStateBuilder *fstSearchWithState(Fst *fst, AutomationCtx *ctx);
 
 bool         fstVerify(Fst *fst);
 
@@ -298,7 +305,7 @@ typedef struct StreamWithState {
   FstOutput     emptyOutput;
   SArray        *stack; // <StreamState>
   FstBoundWithData *endAt;
-} StreamWithState ;
+} StreamWithState;
 
 typedef struct StreamWithStateResult {
   FstSlice data;  
@@ -314,14 +321,8 @@ typedef void* (*StreamCallback)(void *);
 StreamWithState *streamWithStateCreate(Fst *fst, AutomationCtx *automation, FstBoundWithData *min, FstBoundWithData *max) ;
 void streamWithStateDestroy(StreamWithState *sws);
 bool streamWithStateSeekMin(StreamWithState *sws, FstBoundWithData *min);           
-StreamWithStateResult* streamWithStateNextWith(StreamWithState *sws, StreamCallback callback);
 
-typedef struct FstStreamBuilder {
-  Fst *fst; 
-  AutomationCtx *aut;
-  FstBoundWithData *min;  
-  FstBoundWithData *max;
-} FstStreamBuilder;
+StreamWithStateResult* streamWithStateNextWith(StreamWithState *sws, StreamCallback callback);
 
 FstStreamBuilder *fstStreamBuilderCreate(Fst *fst, AutomationCtx *aut); 
 // set up bound range
diff --git a/source/libs/index/inc/index_fst_automation.h b/source/libs/index/inc/index_fst_automation.h
index 4a29f2e3a6df82235afa343f9745bac8e95e4883..6deeb1878a4d2af53dc2b7e076a04264c9556b18 100644
--- a/source/libs/index/inc/index_fst_automation.h
+++ b/source/libs/index/inc/index_fst_automation.h
@@ -50,7 +50,7 @@ typedef struct AutomationFunc {
 } AutomationFunc; 
 
 AutomationCtx *automCtxCreate(void *data, AutomationType type);
-void autoCtxDestroy(AutomationCtx *ctx);
+void automCtxDestroy(AutomationCtx *ctx);
 
 extern AutomationFunc automFuncs[]; 
 #ifdef __cplusplus
diff --git a/source/libs/index/src/index_fst.c b/source/libs/index/src/index_fst.c
index 18e617f6aea951161d8a6edab7d32024645277c0..07f1e343bd8014607939db357aab756c4c7b22ef 100644
--- a/source/libs/index/src/index_fst.c
+++ b/source/libs/index/src/index_fst.c
@@ -1090,6 +1090,12 @@ bool fstGet(Fst *fst, FstSlice *b, Output *out) {
   
   return true; 
 }
+FstStreamBuilder *fstSearch(Fst *fst, AutomationCtx *ctx) {
+  return fstStreamBuilderCreate(fst, ctx);
+}
+FstStreamWithStateBuilder *fstSearchWithState(Fst *fst, AutomationCtx *ctx) {
+  return fstStreamBuilderCreate(fst, ctx);
+}
 
 FstNode *fstGetRoot(Fst *fst) {
   if (fst->root != NULL) {
@@ -1440,3 +1446,5 @@ FstStreamBuilder *fstStreamBuilderRange(FstStreamBuilder *b, FstSlice *val, Rang
 
 
 
+
+
diff --git a/source/libs/index/src/index_fst_automation.c b/source/libs/index/src/index_fst_automation.c
index 748c55c29d4b76a71dd1495de18f6b35bd834e3a..392d8e6e8d6bb0c86faab142fc8bddc294c65d9d 100644
--- a/source/libs/index/src/index_fst_automation.c
+++ b/source/libs/index/src/index_fst_automation.c
@@ -92,6 +92,6 @@ AutomationCtx* automCtxCreate(void *data, AutomationType type) {
   }
   return ctx; 
 } 
-void autoCtxDestroy(AutomationCtx *ctx) {
+void automCtxDestroy(AutomationCtx *ctx) {
   free(ctx);
 }