Fix header contains check for Lambda-Runtime-Aws-Request-Id since .contains() directly on Ktor headers doesn't work

Remove extra printlns

Author: rdbatch

src/commonMain/kotlin/com/batchofcode/lambdaruntime/client/CommonAwsRuntimeClient.kt

@@ -2,6 +2,7 @@ package com.batchofcode.lambdaruntime.client
 
 import com.batchofcode.lambdaruntime.client.exception.BadRequestException
 import com.batchofcode.lambdaruntime.handler.InvocationRequest
+import com.batchofcode.lambdaruntime.util.containsKey
 import com.batchofcode.lambdaruntime.util.fromMap
 import io.ktor.client.HttpClient
 import io.ktor.client.request.post
@@ -24,14 +25,13 @@ class CommonAwsRuntimeClient(private val client: HttpClient) {
     }
 
     suspend fun processRequests(client: HttpClient, handler: (InvocationRequest) -> String) {
-        println("Requesting invocation from http://${EnvironmentConfiguration.lambdaRuntimeApi}/2018-06-01/runtime/invocation/next")
         val invocationHttpRequest =
             client.request<HttpResponse>{
                 url("http://${EnvironmentConfiguration.lambdaRuntimeApi}/2018-06-01/runtime/invocation/next")
                 method = HttpMethod.Get
             }
         try {
-            if (!invocationHttpRequest.headers.contains("Lambda-Runtime-Aws-Request-Id")) {
+            if (!invocationHttpRequest.headers.containsKey("Lambda-Runtime-Aws-Request-Id")) {
                 return
             }
             val invocationRequest = RequestMapper.mapRequest(invocationHttpRequest)

src/commonMain/kotlin/com/batchofcode/lambdaruntime/util/HeaderHelper.kt

@@ -1,10 +1,15 @@
 package com.batchofcode.lambdaruntime.util
 
+import io.ktor.http.Headers
 import io.ktor.http.HeadersBuilder
 
 fun HeadersBuilder.fromMap(headers: Map<String, String>) {
     this.clear()
     headers.forEach {
         this.append(it.key, it.value)
     }
+}
+
+fun Headers.containsKey(key: String): Boolean {
+    return this.entries().any { it.key == key }
 }