Fix splitting utf8 string into words (#385)

cmake/utfcpp.cmake

@@ -1,45 +0,0 @@
-function(download_utfcpp)
-  include(FetchContent)
-
-  set(utfcpp_URL  "https://github.com/nemtrif/utfcpp/archive/refs/tags/v3.2.5.tar.gz")
-  set(utfcpp_URL2 "https://huggingface.co/csukuangfj/sherpa-onnx-cmake-deps/resolve/main/utfcpp-3.2.5.tar.gz")
-  set(utfcpp_HASH "SHA256=14fd1b3c466814cb4c40771b7f207b61d2c7a0aa6a5e620ca05c00df27f25afd")
-
-  # If you don't have access to the Internet,
-  # please pre-download utfcpp
-  set(possible_file_locations
-    $ENV{HOME}/Downloads/utfcpp-3.2.5.tar.gz
-    ${PROJECT_SOURCE_DIR}/utfcpp-3.2.5.tar.gz
-    ${PROJECT_BINARY_DIR}/utfcpp-3.2.5.tar.gz
-    /tmp/utfcpp-3.2.5.tar.gz
-    /star-fj/fangjun/download/github/utfcpp-3.2.5.tar.gz
-  )
-
-  foreach(f IN LISTS possible_file_locations)
-    if(EXISTS ${f})
-      set(utfcpp_URL  "${f}")
-      file(TO_CMAKE_PATH "${utfcpp_URL}" utfcpp_URL)
-      message(STATUS "Found local downloaded utfcpp: ${utfcpp_URL}")
-      set(utfcpp_URL2)
-      break()
-    endif()
-  endforeach()
-
-  FetchContent_Declare(utfcpp
-    URL
-      ${utfcpp_URL}
-      ${utfcpp_URL2}
-    URL_HASH          ${utfcpp_HASH}
-  )
-
-  FetchContent_GetProperties(utfcpp)
-  if(NOT utfcpp_POPULATED)
-    message(STATUS "Downloading utfcpp from ${utfcpp_URL}")
-    FetchContent_Populate(utfcpp)
-  endif()
-  message(STATUS "utfcpp is downloaded to ${utfcpp_SOURCE_DIR}")
-  # add_subdirectory(${utfcpp_SOURCE_DIR} ${utfcpp_BINARY_DIR} EXCLUDE_FROM_ALL)
-  include_directories(${utfcpp_SOURCE_DIR})
-endfunction()
-
-download_utfcpp()