bugfix: Add flite_g2p.h for esp32

include/esp32/esp_mn_iface.h

@@ -52,6 +52,7 @@ typedef struct{
 
 typedef struct {
     char *string;                               // command string
+    char *phonemes;                             // command phonemes, if applicable
     int16_t command_id;                         // the command id
     float threshold;                            // trigger threshold, default: 0
     int16_t *wave;                              // prompt wave data of the phrase

include/esp32/flite_g2p.h

@@ -0,0 +1,20 @@
+#ifndef __FLITE_G2P_H__
+#define __FLITE_G2P_H__
+
+typedef struct {
+    int num_phonemes;
+    int phoneme_size;
+    char **phonemes;
+} flite_g2p_result;
+
+void flite_g2p_result_free(flite_g2p_result *result);
+
+flite_g2p_result *flite_g2p_get_result(char *grapheme);
+
+void flite_g2p_result_print_string(flite_g2p_result *result, int map_phonemes);
+
+char *flite_g2p_result_get_string(flite_g2p_result *result, int map_phonemes);
+
+char *flite_g2p(char *graphemes, int map_phonemes);
+
+#endif