[Python] Python string: extract duplicated and randomly merged substring

Example of duplicated and merged string:

16.01068.0%0 8p%.a .p .a.


Desired substring to be extracted:

16.008% p.a.


Fuller example:

CCoonnttiinnggeenntt CCoouuppoonn 16.01068.0%0 8p%.a .p (.Ma.o (nMtholyn)thly)


Desired substring:

Contingent Coupon 16.008% p.a. (Monthly)


My problem is when the original substring already has duplicate characters (like the two 0s in 16.008), my current function sometimes retains the wrong duplicate character (giving the incorrect result 16.080).

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