Several optimizations in the method formatDurationWords

[fenik17]

Several improvements in method DurationFormatUtils#formatDurationWords:

• Removing a couple unreachable code paths.
• Replacing replaceOnce to removeStart and removeEnd where it possible.
• Saving information about removed parts to reduce scans of string.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.32258% with 3 lines in your changes missing coverage. Please review.

Project coverage is 92.04%. Comparing base (ac2062d) to head (fbe2076).
Report is 1026 commits behind head on master.

Files with missing lines	Patch %	Lines
...apache/commons/lang3/time/DurationFormatUtils.java	90.32%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1018      +/-   ##
============================================
+ Coverage     92.03%   92.04%   +0.01%     
- Complexity     7429     7434       +5     
============================================
  Files           193      193              
  Lines         15672    15684      +12     
  Branches       2899     2904       +5     
============================================
+ Hits          14423    14436      +13     
+ Misses          676      675       -1     
  Partials        573      573              

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