Problem: Add spaces: Morningtemperatureswillbearound21C.Duringthedaytheywillreachamaximumof31C.Lowtemperaturesatnightwillbearound21C.Southwesterlywindsareweak.

Spaces added: Morning temperatures will be around 21 C. During the day they will reach a maximum of 31 C. Low temperatures at night will be around 21C. Southwesterly winds are weak.
This text is missing some spaces, please add them: Powerfailure:Onemorecommonsourcefordatalossispowerfailure.
Power failure: One more common source for data loss is power failure.
input question: Fix spacing: Anirretrievablethinghappened,thevirusbegantogrowandinfectplanetsonitsway.TheGalaxydestinyisinyourhands.

output answer: An irretrievable thing happened, the virus began to grow and infect planets on its way. The Galaxy destiny is in your hands.
Problem: Thesolutionhasbeenthedevelopmentofnewwatertreatmenttechniqueswhichcandramaticallyreducewaterusage,whilealsoreducingenergyconsumptionsignificantly.
What's a sentence that uses these characters?
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The solution has been the development of new water treatment techniques which can dramatically reduce water usage, while also reducing energy consumption significantly.
Add spaces: Withkebabonthetablethey-Helleandthecat-getonfriendlytermsveryquickly.

Answer: With kebab on the table they - Helle and the cat - get on friendly terms very quickly.
This text is missing some spaces, please add them: 17Thereforetohimthatknowethtodogood,anddoethitnot,tohimitissin.
17 Therefore to him that knoweth to do good, and doeth it not, to him it is sin.