Naming issues in the strings directory

[cclauss]

@halafi Can you please make some changes in https://github.com/TheAlgorithms/Go/tree/master/strings ?

1. The directories contain spaces instead of dashes in the directory names. This forces us to quote the directory names when using command line tools such as linters.
2. File names need work also. Is ac.go a calculation for alternating current or is it controller for an air conditioner? Is bom.go a tool for building a bill of materials or does it generate a byte order mark? Why does the reader have to guess?? aho-corasick.go is a much more self-documenting filename than ac.go.
3. Can you help us to get the last two lines of .github/workflows/golangci-lint.yml to pass without || true?

[piyushs2894]

@cclauss I have fixed the issues 1 and 2 and looking for 3rd as well. Can u please review and merge below PR for the same with "hacktoberfest-accepted" label.
#209

[piyushs2894]

@cclauss Regarding golandci-lint failure, it is failing as in single_string_matching and multiple_string_matching directory, some methods like main, commandLineInput, and many more more are redeclared. Go does not allow same method name in single package. Is it has to be fixed ?