[fix] Removing C++ checks from all but the main API functions

src/geohash/geohash.h

@@ -25,9 +25,7 @@ THE SOFTWARE.
 #include <string.h>
 #include <stdlib.h>
 
-#ifdef __cplusplus
-extern "C" {
-#endif
+ 
 
 enum {
     GEOHASH_OK,
@@ -42,8 +40,6 @@ int geohash_encode(double latitude, double longitude, char* r, size_t capacity);
 int geohash_decode(char* r, size_t length, double *latitude, double *longitude);
 int geohash_neighbors(char *hashcode, char* dst, size_t dst_length, int *string_count);
 
-#ifdef __cplusplus
-}
-#endif
+ 
 
 #endif