message: Make use of string utility to remove filename suffix
diff: // Other axom headers
  #include "axom/core/Macros.hpp"
  #include "axom/core/utilities/FileUtilities.hpp"
  +#include "axom/core/utilities/StringUtilities.hpp"
  // SiDRe project headers
  #include "axom/sidre/core/Buffer.hpp"
  @@ -470,19 +471,7 @@ std::string IOManager::createRootFile(const std::string& root_base,
  {
  conduit::Node n;
  - std::string suffix(".root");
  - std::string file_base(root_base);
  -
  - size_t base_size = file_base.size();
  - size_t suffix_size = suffix.size();
  - if(base_size > suffix_size)
  - {
  - if(file_base.compare(base_size - suffix_size, suffix_size, suffix) == 0)
  - {
  - // file_base has ".root" suffix, so remove it.
  - file_base.erase(base_size - suffix_size);
  - }
  - }
  + std::string file_base(utilities::string::removeSuffix(root_base, ".root"));
  if(m_my_rank == 0)
  {
  