Fix always false condition and clean function body

An always false condition was remove from Normalize member function of
FilePath and the body of the function which was poorly writen is
improved.

googletest/src/gtest-filepath.cc

@@ -349,33 +349,19 @@ FilePath FilePath::RemoveTrailingPathSeparator() const {
 // For example, "bar///foo" becomes "bar/foo". Does not eliminate other
 // redundancies that might be in a pathname involving "." or "..".
 void FilePath::Normalize() {
-  if (pathname_.c_str() == nullptr) {
-    pathname_ = "";
-    return;
-  }
-  const char* src = pathname_.c_str();
-  char* const dest = new char[pathname_.length() + 1];
-  char* dest_ptr = dest;
-  memset(dest_ptr, 0, pathname_.length() + 1);
-
-  while (*src != '\0') {
-    *dest_ptr = *src;
-    if (!IsPathSeparator(*src)) {
-      src++;
-    } else {
-#if GTEST_HAS_ALT_PATH_SEP_
-      if (*dest_ptr == kAlternatePathSeparator) {
-        *dest_ptr = kPathSeparator;
-      }
-#endif
-      while (IsPathSeparator(*src))
-        src++;
-    }
-    dest_ptr++;
-  }
-  *dest_ptr = '\0';
-  pathname_ = dest;
-  delete[] dest;
+  std::string normalized_pathname;
+  normalized_pathname.reserve(pathname_.length());
+
+  for (const auto character : pathname_)
+    if (!IsPathSeparator(character))
+      normalized_pathname.push_back(character);
+    else if (normalized_pathname.empty() ||
+             normalized_pathname.back() != kPathSeparator)
+      normalized_pathname.push_back(kPathSeparator);
+    else
+      continue;
+
+  pathname_ = normalized_pathname;
 }
 
 }  // namespace internal