feat: add string conversion functions

[eiixy]

No description provided.

[ccoVeille]

This regexp should/could be moved at package level. Computing the regexp each time you use the method seems a bad thing

[eiixy]

I agree with your point. I have optimized the regex as suggested. Please review the latest commit.

[ccoVeille]

This test should provide real life examples, and include things about Go initialisms

Maybe you could have to look at these repositories:

https://github.com/client9/misspell

https://github.com/ettle/strcase

[eiixy]

I have updated the test cases

[ccoVeille]

This code still looks strange to me

There was a function now deprecated that did this https://pkg.go.dev/strings#Title

It had been replaced by https://pkg.go.dev/golang.org/x/text/cases#Title

[eiixy]

Thank you for your suggested changes.

[ccoVeille]

I would say, keep it simple

for i, r := range runes {
     r = unicode.ToLower(r)
     if i == 0 {
	r = unicode.ToUpper(r)
     }
     runes[i] = r
}

[samber]

Thanks for the contrib. I've been looking for such functions recently \o/

[NathanBaulch]

Is the comment "Dependencies are excluded from releases" in go.mod still true now that this feature has added a runtime dependency on "golang.org/x/text"?

[ccoVeille]

Suggested change

	"golang.org/x/text/cases"
	"golang.org/x/text/language"
	"math/rand"
	"regexp"
	"strings"
	"unicode"
	"unicode/utf8"
	"math/rand"
	"regexp"
	"strings"
	"unicode"
	"unicode/utf8"
	"golang.org/x/text/cases"
	"golang.org/x/text/language"

[samber]

@NathanBaulch I corrected the comment with "dev dependencies"