fixed bug in number_from_string function

[kishanshukla-2307]

No description provided.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@1ec4742). Click here to learn what that means.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master      #46   +/-   ##
=========================================
  Coverage          ?   68.76%           
=========================================
  Files             ?       32           
  Lines             ?    10550           
  Branches          ?        0           
=========================================
  Hits              ?     7255           
  Misses            ?     3295           
  Partials          ?        0           

Impacted Files	Coverage Δ
include/real/exact_number.hpp	91.75% <100.00%> (ø)
test/real_number_from_string_test.cpp	100.00% <100.00%> (ø)
include/real/real_algorithm.hpp	100.00% <0.00%> (ø)
...est/real_iterator_subtraction_subtraction_test.cpp	100.00% <0.00%> (ø)
test/real_greater_than_operator_test.cpp	100.00% <0.00%> (ø)
include/real/real_exception.hpp	3.33% <0.00%> (ø)
include/real/real.hpp	49.38% <0.00%> (ø)
...est/real_iterator_addition_multiplication_test.cpp	100.00% <0.00%> (ø)
.../real_iterator_subtraction_multiplication_test.cpp	100.00% <0.00%> (ø)
... and 24 more

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