Changes to endpoints so they allow to only get context and then the exercises as well as tidying up a bit

app/services/impl/exam/level/exercises/fillBlanks.py

@@ -0,0 +1,73 @@
+import random
+
+from app.configs.constants import GPTModels, TemperatureSettings, EducationalContent
+from app.services.abc import ILLMService
+
+
+class FillBlanks:
+
+    def __init__(self, llm: ILLMService):
+        self._llm = llm
+
+
+    async def gen_fill_blanks(
+            self, quantity: int, start_id: int, size: int, topic=None
+    ):
+        if not topic:
+            topic = random.choice(EducationalContent.MTI_TOPICS)
+
+        messages = [
+            {
+                "role": "system",
+                "content": f'You are a helpful assistant designed to output JSON on this format: {self._fill_blanks_mc_template()}'
+            },
+            {
+                "role": "user",
+                "content": f'Generate a text of at least {size} words about the topic {topic}.'
+            },
+            {
+                "role": "user",
+                "content": (
+                        f'From the generated text choose {quantity} words (cannot be sequential words) to replace '
+                        'once with {{id}} where id starts on ' + str(start_id) + ' and is incremented for each word. '
+                        'The ids must be ordered throughout the text and the words must be replaced only once. '
+                        'For each removed word you will place it in the solutions array and assign a letter from A to D,'
+                        ' then you will place that removed word and the chosen letter on the words array along with '
+                        ' other 3 other words for the remaining letter. This is a fill blanks question for an english '
+                        'exam, so don\'t choose words completely at random.'
+                )
+            }
+        ]
+
+        question = await self._llm.prediction(
+            GPTModels.GPT_4_O, messages,  ["question"], TemperatureSettings.GEN_QUESTION_TEMPERATURE
+        )
+        return {
+            **question,
+            "type": "fillBlanks",
+            "variant": "mc",
+            "prompt": "Click a blank to select the appropriate word for it.",
+        }
+
+    @staticmethod
+    def _fill_blanks_mc_template():
+        return {
+            "text": "",
+            "solutions": [
+                {
+                    "id": "",
+                    "solution": ""
+                }
+            ],
+            "words": [
+                {
+                    "id": "",
+                    "options": {
+                        "A": "",
+                        "B": "",
+                        "C": "",
+                        "D": ""
+                    }
+                }
+            ]
+        }