Capitalize method names properly

[onewhl]

Description

PR fixes the way UTBot capitalizes method names.
Now it capitalizes all parts of the method name properly.

Fixes #485

Type of Change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Automated Testing

See tests in SummaryReturnExampleTest.kt, for example, SummaryReturnExampleTest.testCompareChar().
UTBot generated these names before the fix:

        "testCompareChars_NLessThan1"
        "testCompareChars_0OfCharactertoCharsiEqualsA" // need to change i -> I, to -> To
        "testCompareChars_0OfCharactertoCharsiEqualsB" // need to change i -> I, to -> To
        "testCompareChars_0OfCharactertoCharsiNotEqualsB" // need to change i -> I, to ->To

And these names after the fix:

       "testCompareChars_NLessThan1"
       "testCompareChars_0OfCharacterToCharsIEqualsA"
       "testCompareChars_0OfCharacterToCharsIEqualsB"
       "testCompareChars_0OfCharacterToCharsINotEqualsB"

Checklist (remove irrelevant options):

• The change followed the style guidelines of the UTBot project
• Self-review of the code is passed
• The change contains enough commentaries, particularly in hard-to-understand areas
• New documentation is provided or existed one is altered
• No new warnings
• Tests that prove my change is effective
• All tests pass locally with my changes

[onewhl]

I don't know why tests in InnerMockWithFieldExampleTest and MockWithFieldExampleTest fail.
I noticed that it happens in other PRs opened today, so it seems that some other commit in the main branch broke the test.

[amandelpie]

Please do something with the isLegitSymbolForFunctionName function

[amandelpie]

LGTM