Logic App Extracting String and Group them to Body Email

Hello here is the snippet of my code and I am trying to get the AppId from this represented in the following manner in oder to send it via mail.

 {
                        "appId": "com.google.ios.youtube"
                    },
                    {
                        "appId": "com.keepassium.ios"
                    },
                    {
                        "appId": "com.markmcguill.strongbox"
                    },
                    {
                        "appId": "com.microsoft.azureauthenticator"
                    },
                    {
                        "appId": "com.microsoft.Office.Excel"
                    },
                    {
                        "appId": "com.microsoft.Office.Powerpoint"
                    },
                    {
                        "appId": "com.microsoft.Office.Word"
                    },
                    {
                        "appId": "com.microsoft.onenote"
                    },
                    {
                        "appId": "com.microsoft.rdc.ios"
                    },
                    {
                        "appId": "com.microsoft.skydrive"
                    }

What i expect is:
Youtube
ios
strongbox
......

I tried this

and I got this one

The Problem is: if I want to send a mail this will be sent at least 23 times and it'll cause chaos. How can I group them like this:

• Youtube
• ios
• strongbox

and send them once. Sorry to be long and thanks in advance for your contribution.

I have reproduced in my environment and got expected results as below:

You can use Empty array variable and Join Operator with space for this:

Output:

After this you can use Email as an action.

Code view:

{
"definition": {
"$schema": "https://schema.management.azure.com/providers/Microsoft.Logic/schemas/2016-06-01/workflowdefinition.json#",
"actions": {
"For_each": {
"actions": {
"Append_to_array_variable": {
"inputs": {
"name": "var",
"value": "@outputs('Compose')"
},
"runAfter": {
"Compose": [
"Succeeded"
]
},
"type": "AppendToArrayVariable"
},
"Compose": {
"inputs": "@last(split(items('For_each')['appId'],'.'))",
"runAfter": {},
"type": "Compose"
}
},
"foreach": "@body('Parse_JSON')",
"runAfter": {
"Parse_JSON": [
"Succeeded"
]
},
"type": "Foreach"
},
"Initialize_variable": {
"inputs": {
"variables": [
{
"name": "var",
"type": "array"
}
]
},
"runAfter": {},
"type": "InitializeVariable"
},
"Join": {
"inputs": {
"from": "@variables('var')",
"joinWith": " "
},
"runAfter": {
"For_each": [
"Succeeded"
]
},
"type": "Join"
},
"Parse_JSON": {
"inputs": {
"content": "@triggerBody()",
"schema": {
"items": {
"properties": {
"appId": {
"type": "string"
}
},
"required": [
"appId"
],
"type": "object"
},
"type": "array"
}
},
"runAfter": {
"Initialize_variable": [
"Succeeded"
]
},
"type": "ParseJson"
}
},
"contentVersion": "1.0.0.0",
"outputs": {},
"parameters": {},
"triggers": {
"manual": {
"inputs": {
"schema": {}
},
"kind": "Http",
"type": "Request"
}
}
},
"parameters": {}
}

EDIT:

Used space - space here:

Output: