fix: Fixed warning for nullables

Author: OMpawar-21

Contentstack.Management.Core/Models/Stack.cs

@@ -843,7 +843,7 @@ public Release Release(string? uid = null)
         /// </code></pre>
         /// </example>
         /// <returns>The <see cref="Models.Workflow" /></returns>
-        public Workflow Workflow(string uid = null)
+        public Workflow Workflow(string? uid = null)
         {
             ThrowIfNotLoggedIn();
             ThrowIfAPIKeyEmpty();

Contentstack.Management.Core/Models/Workflow.cs

@@ -25,7 +25,7 @@ internal Workflow(Stack stack, string uid)
         /// </code></pre>
         /// </example>
         /// <returns>The <see cref="ContentstackResponse"/>.</returns>
-        public virtual ContentstackResponse FindAll(ParameterCollection collection = null)
+        public virtual ContentstackResponse FindAll(ParameterCollection? collection = null)
         {
             stack.ThrowIfNotLoggedIn();
             ThrowIfUidNotEmpty();
@@ -45,7 +45,7 @@ public virtual ContentstackResponse FindAll(ParameterCollection collection = nul
         /// </code></pre>
         /// </example>
         /// <returns>The <see cref="ContentstackResponse"/>.</returns>
-        public virtual Task<ContentstackResponse> FindAllAsync(ParameterCollection collection = null)
+        public virtual Task<ContentstackResponse> FindAllAsync(ParameterCollection? collection = null)
         {
             stack.ThrowIfNotLoggedIn();
             ThrowIfUidNotEmpty();
@@ -66,7 +66,7 @@ public virtual Task<ContentstackResponse> FindAllAsync(ParameterCollection colle
         /// </example>
         /// <param name="model">Workflow Model for creating workflow.</param>
         /// <returns></returns>
-        public override ContentstackResponse Create(WorkflowModel model, ParameterCollection collection = null)
+        public override ContentstackResponse Create(WorkflowModel model, ParameterCollection? collection = null)
         {
             return base.Create(model, collection);
         }
@@ -83,7 +83,7 @@ public override ContentstackResponse Create(WorkflowModel model, ParameterCollec
         /// </example>
         /// <param name="model">Workflow Model for creating workflow.</param>
         /// <returns></returns>
-        public override Task<ContentstackResponse> CreateAsync(WorkflowModel model, ParameterCollection collection = null)
+        public override Task<ContentstackResponse> CreateAsync(WorkflowModel model, ParameterCollection? collection = null)
         {
             return base.CreateAsync(model, collection);
         }
@@ -100,7 +100,7 @@ public override Task<ContentstackResponse> CreateAsync(WorkflowModel model, Para
         /// </example>
         /// <param name="model">Workflow Model for updating Content Type.</param>
         /// <returns></returns>
-        public override ContentstackResponse Update(WorkflowModel model, ParameterCollection collection = null)
+        public override ContentstackResponse Update(WorkflowModel model, ParameterCollection? collection = null)
         {
             return base.Update(model, collection);
         }
@@ -117,7 +117,7 @@ public override ContentstackResponse Update(WorkflowModel model, ParameterCollec
         /// </example>
         /// <param name="model">Workflow Model for updating Content Type.</param>
         /// <returns></returns>
-        public override Task<ContentstackResponse> UpdateAsync(WorkflowModel model, ParameterCollection collection = null)
+        public override Task<ContentstackResponse> UpdateAsync(WorkflowModel model, ParameterCollection? collection = null)
         {
             return base.UpdateAsync(model, collection);
         }
@@ -132,7 +132,7 @@ public override Task<ContentstackResponse> UpdateAsync(WorkflowModel model, Para
         /// </code></pre>
         /// </example>
         /// <returns>The <see cref="ContentstackResponse"/>.</returns>
-        public override ContentstackResponse Fetch(ParameterCollection collection = null)
+        public override ContentstackResponse Fetch(ParameterCollection? collection = null)
         {
             return base.Fetch(collection);
         }
@@ -147,7 +147,7 @@ public override ContentstackResponse Fetch(ParameterCollection collection = null
         /// </code></pre>
         /// </example>
         /// <returns>The Task.</returns>
-        public override Task<ContentstackResponse> FetchAsync(ParameterCollection collection = null)
+        public override Task<ContentstackResponse> FetchAsync(ParameterCollection? collection = null)
         {
             return base.FetchAsync(collection);
         }
@@ -162,7 +162,7 @@ public override Task<ContentstackResponse> FetchAsync(ParameterCollection collec
         /// </code></pre>
         /// </example>
         /// <returns>The <see cref="ContentstackResponse"/>.</returns>
-        public override ContentstackResponse Delete(ParameterCollection collection = null)
+        public override ContentstackResponse Delete(ParameterCollection? collection = null)
         {
             return base.Delete(collection);
         }
@@ -177,7 +177,7 @@ public override ContentstackResponse Delete(ParameterCollection collection = nul
         /// </code></pre>
         /// </example>
         /// <returns>The Task.</returns>
-        public override Task<ContentstackResponse> DeleteAsync(ParameterCollection collection = null)
+        public override Task<ContentstackResponse> DeleteAsync(ParameterCollection? collection = null)
         {
             return base.DeleteAsync(collection);
         }
@@ -269,7 +269,7 @@ public virtual Task<ContentstackResponse> EnableAsync()
         /// </example>
         /// <param name="uid">Optional Publish rule uid for performing rule specific operation</param>
         /// <returns></returns>
-        public PublishRule PublishRule(string uid = null)
+        public PublishRule PublishRule(string? uid = null)
         {
             return new PublishRule(stack, uid);
         }