Issue #1:

- turn API function into class
- raise error
- requests are did by internal method

src/core/fetch_api.py

@@ -7,8 +7,32 @@
 from src.core.utils.exceptions import PackageNotFound
 
 
-def fetch_api(osv_model: OsvModel) -> dict:
-    """Fetch the OSV API and return a Json"""
+import requests
+
+
+class OsvApi:
+    """Deal with OsvApi to get package Vulnerabilities
+
+    usage:
+    >>> django_pkg = OsvModel("Django", "3.0")
+    >>> response = OsvApi(django_pkg).fetch()
+    {...}
+    """
+
+    def __init__(self, osv_parameters: OsvModel):
+
+        # Attributes
+        self.api_parameters = osv_parameters.get_data()
+
+    def fetch(self):
+        json: dict = self.__request()
+        if json:
+            return json
+        else:
+            raise PackageNotFound
+
+    def __request(self) -> dict:
+        """Fetch the OSV API and return a Json"""
 
         osv_link = "https://api.osv.dev/v1/query"