Fix escaping bug (#19)

package software.amazon.smithy.rust.codegen.util

fun String.doubleQuote(): String = "\"$this\""

fun String.singleQuote(): String = "\'$this\'"

fun String.doubleQuote(): String = "\"${this.slashEscape('"')}\""

fun String.slashEscape(char: Char) = this.replace(char.toString(), """\$char""")

/**

 * Double quote a string, eg. "abc" -> "\"abc\""

package software.amazon.smithy.rust.codegen.util

import io.kotest.matchers.shouldBe

import org.junit.jupiter.api.Test

internal class StringsTest {

    @Test

    fun doubleQuote() {

        "abc".doubleQuote() shouldBe "\"abc\""

        """{"some": "json"}""".doubleQuote() shouldBe """"{\"some\": \"json\"}""""

    }

}